spillway (n.) Look up spillway at Dictionary.com
1889, from spill + way (n.).
spilth (n.) Look up spilth at Dictionary.com
"that which is spilled," c. 1600, from spill (v.) + -th (2). Used, once, by Shakespeare.
spin (v.) Look up spin at Dictionary.com
Old English spinnan (transitive) "draw out and twist fibers into thread," strong verb (past tense spann, past participle spunnen), from Proto-Germanic *spenwan (cognates: Old Norse and Old Frisian spinna, Danish spinde, Dutch spinnen, Old High German spinnan, German spinnen, Gothic spinnan), from PIE *spen-wo-, from root *(s)pen- "to draw, stretch, spin" (cognates: Armenian henum "I weave;" Greek patos "garment," literally "that which is spun;" Lithuanian pinu "I plait, braid," spandau "I spin;" Middle Welsh cy-ffiniden "spider;" see span (v.)).

Intransitive senses of "to form threads from fibrous stuff; to twist, writhe" developed in late Old English. Transitive sense of "cause to turn rapidly" is from 1610s; intransitive meaning "revolve, turn around rapidly" first recorded 1660s. Meaning "attempt to influence reporters' minds after an event has taken place but before they have written about it" seems to have risen to popularity in the 1984 U.S. presidential campaign; as in spin doctor, first attested 1984.
spin (n.) Look up spin at Dictionary.com
1831, "a rapid revolving motion," from spin (v.). Meaning "fairly rapid ride" is from 1856. Sense of "a twisting delivery in throwing or striking a ball" is from 1851. Sense in physics is from 1926. Meaning "act of playing a phonograph record" is from 1977. Meaning "influence imparted by a media source" is from 1984.
spinach (n.) Look up spinach at Dictionary.com
c. 1400 (late 13c. as a surname), from Anglo-French spinache, Old French espinache (14c., Modern French épinard, from a form with a different suffix), from Old Provençal espinarc, which perhaps is via Catalan espinac, from Andalusian Arabic isbinakh, from Arabic isbanakh, from Persian aspanakh "spinach." But OED is not convinced the Middle Eastern words are native, and based on the plethora of Romanic forms pronounces the origin "doubtful."

Popeye, the spinach-eating superman, debuted in 1929. Old folk etymology connected the word with Latin spina (see spine) or with Medieval Latin Hispanicum olus. For pronunciation, see cabbage. In 1930s colloquial American English, it had a sense of "nonsense, rubbish," based on a famous "New Yorker" cartoon of Dec. 8, 1928. Related: spinaceous.
spinal (adj.) Look up spinal at Dictionary.com
1570s, from Late Latin spinalis "of or pertaining to a thorn or the spine," from Latin spina (see spine). Spinal tap recorded from 1960.
spindle (n.) Look up spindle at Dictionary.com
early 13c., with intrusive -d-, from Old English spinel "small wooden bar used in hand-spinning," properly "an instrument for spinning," from stem of spinnan (see spin (v.)) + instrumental suffix -el (1). Compare handle, thimble, etc.

Related to Old Saxon spinnila, Old Frisian spindel, Old High German spinnila, German Spindel. As a type of something slender, it is attested from 1570s. As with distaff, sometimes formerly used as a metonym for "the female sex," as in Old English spinelhealf "female line of descent," distinguished from sperehealf "male line of descent."
spindly (adj.) Look up spindly at Dictionary.com
1650s, from spindle + -y (2). Related: Spindliness.
spindrift (n.) Look up spindrift at Dictionary.com
spray of salt water blown along the surf of the sea in heavy winds, c. 1600, Scottish formation from verb spene, alteration of spoon "to sail before the wind" (1570s, of uncertain origin) + drift (n.). "Common in English writers from c 1880, probably at first under the influence of W. Black's novels" [OED].
spine (n.) Look up spine at Dictionary.com
c. 1400, "backbone," later "thornlike part" (early 15c.), from Old French espine "thorn, prickle; backbone, spine" (12c., Modern French épine), from Latin spina "backbone," originally "thorn, prickle" (figuratively, in plural, "difficulties, perplexities"), from PIE *spe-ina-, from root *spei- "sharp point" (see spike (n.1)). Meaning "the back of a book" is first attested 1922.
spine-chiller (n.) Look up spine-chiller at Dictionary.com
"mystery film," 1940, from spine + agent noun from chill (v.). Spine-tingler in same sense is from 1942.
spineless (adj.) Look up spineless at Dictionary.com
1827 of animals (1805 of plants), from spine + -less. Meaning "lacking moral force" is from 1885. Related: Spinelessly; spinelessness.
spinet (n.) Look up spinet at Dictionary.com
1660s, spinette, "small harpsichord," from Middle French espinette (16c., Modern French épinette), from Italian spinetta, said by Scaliger to be a diminutive of spina "thorn, spine," from Latin spina "thorn" (see spine), so called because the strings were plucked with thorn-like quills [Barnhart]. The other theory (favored by Klein and assigned "greater probability" by OED) dates to early 17c. and claims the word is from the name of the Venetian inventor, Giovanni Spinetti (fl. c. 1503). As "small, upright piano" from 1936.
spinnaker (n.) Look up spinnaker at Dictionary.com
"large triangular sail," 1866, either a derivative of spin in the sense of "go rapidly" or a corrupt pronunciation of Sphinx, which was the name of the first yacht known to carry this type of sail.
spinner (n.) Look up spinner at Dictionary.com
early 13c., "spider," agent noun from spin (v.). Meaning "person who spins textile thread" is from late 14c.
spinneret (n.) Look up spinneret at Dictionary.com
"silk-spinning organ of a silkworm or spider," coined 1826, diminutive of spinner with -et.
spinney (n.) Look up spinney at Dictionary.com
"copse, thicket," 1590s, from Old French espinoi "briar-patch, place full of thorns and brambles" (13c., Modern French épinaie), from espine or from Latin spinetum "thorn hedge, thicket" (see spine).
spinning (n.) Look up spinning at Dictionary.com
late 13c., verbal noun from spin (v.). Spinning wheel attested from c. 1400. Spinning-jenny is from 1783 (see jenny); invented by James Hargreaves c. 1764-7, patented 1770.
spinoff (n.) Look up spinoff at Dictionary.com
also spin-off, 1951 of corporate entities; by 1967 of television shows, from spin + off. As a figurative verbal phrase, by 1957. As an adjective, from 1966.
spinster (n.) Look up spinster at Dictionary.com
mid-14c., "female spinner of thread," from Middle English spinnen (see spin) + -stere, feminine suffix (see -ster). Unmarried women were supposed to occupy themselves with spinning, hence the word came to be "the legal designation in England of all unmarried women from a viscount's daughter downward" [Century Dictionary] in documents from 1600s to early 1900s, and by 1719 the word was being used generically for "woman still unmarried and beyond the usual age for it."
Spinster, a terme, or an addition in our Common Law, onely added in Obligations, Euidences, and Writings, vnto maids vnmarried. [John Minsheu, "Ductor in Linguas," 1617]
Strictly in reference to those who spin, spinster also was used of both sexes (compare webster, baxter, brewster) and so a double-feminine form emerged, spinstress "a female spinner" (1640s), which by 1716 also was being used for "maiden lady." Related: Spinsterhood.
spiny (adj.) Look up spiny at Dictionary.com
1580s, from spine + -y (2). Related: Spininess.
spiracle (n.) Look up spiracle at Dictionary.com
"air hole," 1610s, from Latin spiraculum "breathing hole," from spirare "to breathe" (see spirit (n.)). Related: Spiracular.
spiral (adj.) Look up spiral at Dictionary.com
1550s, from Middle French spiral (16c.), from Medieval Latin spiralis "winding around a fixed center, coiling" (mid-13c.), from Latin spira "a coil, fold, twist, spiral," from Greek speira "a winding, a coil, twist, wreath, anything wound or coiled," from PIE *sper-ya-, from base *sper- (2) "to turn, twist." Related: Spirally. Spiral galaxy first attested 1913.
spiral (v.) Look up spiral at Dictionary.com
1726 (implied in spiraled), transitive, from spiral (n.). Intransitive use by 1834. Transferred and figurative sense by 1922. Related: Spiraling.
spiral (n.) Look up spiral at Dictionary.com
1650s, from spiral (adj.). U.S. football sense is from 1896. Figurative sense of "progressive movement in one direction" is by 1897. Of books, spiral-bound (adj.) is from 1937.
spirant (n.) Look up spirant at Dictionary.com
breathy consonant, 1862, from Latin spirantem (nominative spirans) "breathing," present participle of spirare "to breathe, blow" (see spirit (n.)).
spire (n.) Look up spire at Dictionary.com
Old English spir "a sprout, shoot, spike, blade, tapering stalk of grass," from Proto-Germanic *spiraz (cognates: Old Norse spira "a stalk, slender tree," Dutch spier "shoot, blade of grass," Middle Low German spir "a small point or top"), from PIE *spei- "sharp point" (see spike (n.1)). Meaning "tapering top of a tower or steeple" first recorded 1590s (a sense attested in Middle Low German since late 14c. and also found in the Scandinavian cognates).
spire (v.) Look up spire at Dictionary.com
early 14c., "send up shoots," from spire (n.). Related: Spired; spiring.
spirillum (n.) Look up spirillum at Dictionary.com
(plural spirilla), 1875, Modern Latin, diminutive of Latin spira (see spiral (adj.)). So called for their structure.
spirit (v.) Look up spirit at Dictionary.com
1590s, "to make more active or energetic" (of blood, alcohol, etc.), from spirit (n.). The meaning "carry off or away secretly" (as though by supernatural agency) is first recorded 1660s. Related: Spirited; spiriting.
spirit (n.) Look up spirit at Dictionary.com
mid-13c., "animating or vital principle in man and animals," from Anglo-French spirit, Old French espirit "spirit, soul" (12c., Modern French esprit) and directly from Latin spiritus "a breathing (respiration, and of the wind), breath; breath of a god," hence "inspiration; breath of life," hence "life;" also "disposition, character; high spirit, vigor, courage; pride, arrogance," related to spirare "to breathe," perhaps from PIE *(s)peis- "to blow" (cognates: Old Church Slavonic pisto "to play on the flute"). But de Vaan says "Possibly an onomatopoeic formation imitating the sound of breathing. There are no direct cognates."

Meaning "supernatural immaterial creature; angel, demon; an apparition, invisible corporeal being of an airy nature" is attested from mid-14c.; from late 14c. as "a ghost" (see ghost (n.)). From c. 1500 as "a nature, character"; sense of "essential principle of something" (in a non-theological context, as in Spirit of St. Louis) is attested from 1680s, common after 1800; Spirit of '76 in reference to the qualities that sparked and sustained the American Revolution is attested by 1797 in William Cobbett's "Porcupine's Gazette and Daily Advertiser."

From late 14c. in alchemy as "volatile substance; distillate;" from c. 1500 as "substance capable of uniting the fixed and the volatile elements of the philosopher's stone." Hence spirits "volatile substance;" sense narrowed to "strong alcoholic liquor" by 1670s. This also is the sense in spirit level (1768). Also from mid-14c. as "character, disposition; way of thinking and feeling, state of mind; source of a human desire;" in Middle English freedom of spirit meant "freedom of choice." From late 14c. as "divine substance, divine mind, God;" also "Christ" or His divine nature; "the Holy Ghost; divine power;" also, "extension of divine power to man; inspiration, a charismatic state; charismatic power, especially of prophecy." Also "essential nature, essential quality." From 1580s in metaphoric sense "animation, vitality."

According to Barnhart and OED, originally in English mainly from passages in Vulgate, where the Latin word translates Greek pneuma and Hebrew ruah. Distinction between "soul" and "spirit" (as "seat of emotions") became current in Christian terminology (such as Greek psykhe vs. pneuma, Latin anima vs. spiritus) but "is without significance for earlier periods" [Buck]. Latin spiritus, usually in classical Latin "breath," replaces animus in the sense "spirit" in the imperial period and appears in Christian writings as the usual equivalent of Greek pneuma. Spirit-rapping is from 1852.
spirited (adj.) Look up spirited at Dictionary.com
"lively, energetic," 1590s, from spirit (v.) in its older sense. Milton uses it to mean "possessed by a spirit." Related: Spiritedly; spiritedness.
spiritless (adj.) Look up spiritless at Dictionary.com
1560s, "dead," from spirit (n.) + -less. Meaning "having no vigor or vivacity" is from 1650s. Related: Spiritlessly.
spiritual (adj.) Look up spiritual at Dictionary.com
c. 1300, "of or concerning the spirit" (especially in religious aspects), from Old French spirituel, esperituel (12c.) or directly from a Medieval Latin ecclesiastical use of Latin spiritualis "of or pertaining to breath, breathing, wind, or air; pertaining to spirit," from spiritus "of breathing, of the spirit" (see spirit (n.)). Meaning "of or concerning the church" is attested from mid-14c. Related: Spiritually. An Old English word for "spiritual" was godcundlic.
In avibus intellige studia spiritualia, in animalibus exercitia corporalia [Richard of St. Victoror (1110-1173): "Watch birds to understand how spiritual things move, animals to understand physical motion." - E.P.]
spiritual (n.) Look up spiritual at Dictionary.com
"African-American religious song," 1866, from spiritual (adj.). Earlier "a spiritual thing" (1660s).
spiritual-minded (adj.) Look up spiritual-minded at Dictionary.com
1526 (Tindale), from spiritual (adj.) + minded. Related: Spiritual-mindedness.
spiritualism (n.) Look up spiritualism at Dictionary.com
1796, "advocacy of a spiritual view" (opposed to materialism), from spiritual + -ism. Table-rapping sense is from 1853.
spiritualist (n.) Look up spiritualist at Dictionary.com
1852, "one who believes in the ability of the living to communicate with the dead via a medium," from spiritual + -ist (also see spirit (n.)). Earlier (1640s) "one with regard for spiritual things." Related Spiritualistic.
Every two or three years the Americans have a paroxysm of humbug -- ... at the present time it is Spiritual-ism. [J.Dix, "Transatlantic Tracings," 1853]
spirituality (n.) Look up spirituality at Dictionary.com
early 15c., "the clergy," also "ecclesiastical property; things pertaining to the Church," from Middle French spiritualite, from Late Latin spiritualitatem (nominative spiritualitas), from Latin spiritualis (see spiritual). Meaning "quality of being spiritual" is from c. 1500; seldom-used sense of "fact or condition of being a spirit" is from 1680s. An earlier form was spiritualty (late 14c.).

English is blessed with multiple variant forms of many words. But it has made scant use of them; for every pair historic/historical; realty/reality, or luxuriant/luxurious there is a spiritualty/spirituality or a specialty/speciality, with two distinct forms, two senses requiring differentiation, hundreds of years gone by, and but little progress made in in sorting them out.
spiritualize (v.) Look up spiritualize at Dictionary.com
1630s, from spiritual (adj.) + -ize, or from French spiritualiser. Related: Spiritualize; spiritualizing; spiritualization.
spiritualty (n.) Look up spiritualty at Dictionary.com
late 14c., "spirituality, quality of being spiritual;" from c. 1400 as "the clergy," from Old French espiritualte, espirituaute, variants of spiritualite, from Late Latin spiritualitatem (see spirituality).
spirituous (adj.) Look up spirituous at Dictionary.com
1590s, "spirited, animated," from Latin spiritus (see spirit (n.)) + -ous, or else from Middle French spiritueux (16c.), from Vulgar Latin *spirituosus, from Latin spiritus. Meaning "containing alcohol" is from 1680s. Related: Spiritously; spiritousness.
spiro- Look up spiro- at Dictionary.com
word-forming element meaning "twisted, spiraled, whorled," from comb. form of Latin spira "a coil, twist," from Greek speira (see spiral (adj.)).
spirochete (n.) Look up spirochete at Dictionary.com
1877, from Modern Latin Spirochæta, the genus name, from spiro- Modern Latin comb. form of Greek speira "a coil" (see spiral (adj.)) + Greek khaite "hair" (see chaeto-).
spirometer (n.) Look up spirometer at Dictionary.com
contrivance for measuring lung capacity, 1846, formed irregularly from Latin spirare "to breathe" (see spirit (n.)) + -meter. Related: Spirometry.
spissitude (n.) Look up spissitude at Dictionary.com
"density, thickness, compactness," mid-15c., from Latin spissitudo "thickness, density," from spissus "thick, dense, compact, close" (source of Italian spesso, Spanish espeso, Old French espes, French épais). Related: Spissated.
spit (v.1) Look up spit at Dictionary.com
"expel saliva," Old English spittan (Anglian), spætan (West Saxon), transitive and intransitive, past tense *spytte, from Proto-Germanic *spitjan, from PIE *sp(y)eu-, of imitative origin (see spew (v.)). Not the usual Old English word for this; spætlan (see spittle) and spiwan are more common; all are from the same root. To spit as a gesture of contempt (especially at someone) is in Old English. Related: Spat; spitting.
spit (n.2) Look up spit at Dictionary.com
"sharp-pointed rod for roasting meat," late Old English spitu "a spit," from Proto-Germanic *spituz (cognates: Middle Dutch and Dutch spit, Swedish spett (which perhaps is from Low German), Old High German spiz, German Spieß "roasting spit," German spitz "pointed"), from PIE *spei- "sharp point" (see spike (n.1)). This is also the source of the word meaning "sandy point" (1670s). Old French espois, Spanish espeto "spit" are Germanic loan-words. The verb meaning "to put on a spit" is recorded from c. 1200.
spit (n.1) Look up spit at Dictionary.com
"saliva," early 14c., from spit (v.1). Meaning "the very likeness" in modern use is attested from 1825 (as in spitting image, attested from 1887); compare French craché in same sense. Spit-curl (1831) was originally considered colloquial or vulgar. Military phrase spit and polish first recorded 1895.
spit (v.2) Look up spit at Dictionary.com
c. 1200, "put on a spit, thrust with a spit," from late Old English sputtian "to spit" (for cooking), from spit (n.2). Meaning "pierce with a weapon, transfix, impale" is from early 15c. Related: Spitted; spitting. Nares' Glossary has spit-frog "a small sword."