horndog (n.) Look up horndog at Dictionary.com
by 1995, from horn (n.) in the sexual sense (see horny) + dog (n.).
hornet (n.) Look up hornet at Dictionary.com
Old English hyrnet, hurnitu "large wasp, beetle," probably from Proto-Germanic *hurz-nut- (cognates: Old Saxon hornut, Middle Dutch huersel, Dutch horzel, Old High German hornaz, German Hornisse "hornet"), from PIE imitative (buzzing) root *krs-, as preserved in Old Church Slavonic srusa, Lithuanian szirszu "wasp." On this theory, the English word (as well as German Hornisse) was altered by influence of horn, to suggest either "horner" (from the sting) or "horn-blower" (from the buzz). Compare also Old Saxon hornobero "hornet," literally "trumpeter."
hornpipe (n.) Look up hornpipe at Dictionary.com
c. 1400, hornepype, "musical instrument with bell and mouthpiece made of horn," from horn (n.) + pipe (n.1). Later (late 15c.) "dance associated with sailors" (originally performed to music from such an instrument).
hornswoggle (v.) Look up hornswoggle at Dictionary.com
"to cheat," 1829, probably a fanciful formation. Related: Hornswoggled; hornswoggling.
horny (adj.) Look up horny at Dictionary.com
"lustful, sexually aroused," definitely in use 1889, perhaps attested as early as 1863; from late 18c. slang expression to have the horn, suggestive of male sexual excitement (but eventually applied to women as well); see horn (n.).
horology (n.) Look up horology at Dictionary.com
science of time, 1819, probably from Greek hora "hour" (see hour) + -logy. Earlier it meant "clock, clock dial" (c. 1500), from Latin horologium. Related: Horologist.
horometry (n.) Look up horometry at Dictionary.com
"measurement of time," 1560s, from Greek hora (see hour) + -metry. Related: Horometrical.
horoscope (n.) Look up horoscope at Dictionary.com
c.1050, horoscopus, from Latin horoscopus; the modern form is considered to be a mid-16c. reborrowing via Middle French horoscope. Ultimately from Greek horoskopos "nativity, horoscope," also "one who casts a horoscope," from hora "hour" (see year) + skopos "watcher; what is watched" (see scope (n.1)), in reference to the hour of one's birth.
horrendous (adj.) Look up horrendous at Dictionary.com
1650s, from Latin horrendus "dreadful, fearful, terrible," literally "to be shuddered at," gerundive of horrere "to bristle with fear, shudder" (see horror). Earlier form in English was horrend (mid-15c.).
horrible (adj.) Look up horrible at Dictionary.com
c. 1300, from Old French horrible, orrible (12c.) "horrible, repugnant, terrifying," from Latin horribilis "terrible, fearful, dreadful," from horrere "to bristle with fear, shudder" (see horror). Used as a mere intensifier from mid-15c.
horribly (adv.) Look up horribly at Dictionary.com
mid-14c., from horrible + -ly (2).
horrid (adj.) Look up horrid at Dictionary.com
early 15c., "hairy, shaggy, bristling," from Latin horridus "bristly, prickly, rough, horrid, frightful," from horrere "to bristle with fear, shudder" (see horror). Meaning "horrible, causing horror" is from c. 1600. Sense weakened 17c. to "unpleasant, offensive."
[W]hile both [horrible and horrid] are much used in the trivial sense of disagreeable, horrible is still quite common in the graver sense inspiring horror, which horrid tends to lose .... [Fowler]
Related: Horridly.
horrific (adj.) Look up horrific at Dictionary.com
"causing horror," 1650s, from French horrifique or directly from Latin horrificus "dreadful, exciting terror," literally "making the hair stand on end," from horrere "to bristle, to stand on end" (see horror) + -ficus, from stem of facere "to make, do" (see factitious). Related: Horrifically.
horrify (v.) Look up horrify at Dictionary.com
1791 (implied in horrifying), from horror + -fy. Related: Horrified; horrifying.
horripilation (n.) Look up horripilation at Dictionary.com
from Late Latin horripilationem (nominative horripilatio), noun of action from past participle stem of horripilare, from stem of horrere "to bristle" (see horror) + pilus "hair" (see pile (n.3)).
horror (n.) Look up horror at Dictionary.com
early 14c., from Old French horror (12c., Modern French horreur) and directly from Latin horror "dread, veneration, religious awe," a figurative use, literally "a shaking, trembling, shudder, chill," from horrere "to bristle with fear, shudder," from PIE root *ghers- "to bristle" (cognates: Sanskrit harsate "bristles," Avestan zarshayamna- "ruffling one's feathers," Latin eris (genitive) "hedgehog," Welsh garw "rough"). As a genre in film, 1934. Chamber of horrors originally (1849) was a gallery of notorious criminals in Madame Tussaud's wax exhibition.
hors d'oeuvre Look up hors d'oeuvre at Dictionary.com
1714, as an adverb, "out of the ordinary," from French hors d'oeuvre, "outside the ordinary courses (of a meal)," literally "apart from the main work," from hors, variant of fors "outside" (from Latin foris; see foreign) + de "from" + oeuvre "work," from Latin opera (see opus). Meaning "extra dish set out before a meal or between courses" attested in English from 1742.
hors de combat Look up hors de combat at Dictionary.com
1757, French, literally "out of combat."
horse (n.) Look up horse at Dictionary.com
Old English hors, from Proto-Germanic *hursa- (cognates: Old Norse hross, Old Frisian hors, Middle Dutch ors, Dutch ros, Old High German hros, German Roß "horse"), of unknown origin, connected by some with PIE root *kurs-, source of Latin currere "to run" (see current (adj.)).

The usual Indo-European word is represented by Old English eoh, from PIE *ekwo- "horse" (see equine). In many other languages, as in English, this root has been lost in favor of synonyms, probably via superstitious taboo on uttering the name of an animal so important in Indo-European religion.

Used since at least late 14c. of various devices or appliances which suggest a horse (as in sawhorse). To ride a horse that was foaled of an acorn (1670s) was through early 19c. a way to say "be hanged from the gallows." Slang for heroin is first attested 1950. Horse latitudes first attested 1777, the name of unknown origin, despite much speculation. Dead horse as a figure for "something that has ceased to be useful" is attested from 1630s.
HORSEGODMOTHER, a large masculine wench; one whom it is difficult to rank among the purest and gentlest portion of the community. [John Trotter Brockett, "A Glossary of North Country Words," 1829]
The horse's mouth as a source of reliable information is from 1921, perhaps originally of racetrack tips, from the fact that a horse's age can be determined accurately by looking at its teeth. To swap horses while crossing the river (a bad idea) is from the American Civil War and appears to have been originally one of Abe Lincoln's stories. Horse and buggy meaning "old-fashioned" is recorded from 1926 slang, originally in reference to a "young lady out of date, with long hair."
horse (v.) Look up horse at Dictionary.com
Old English horsian "to provide with a horse or horses," from horse (n.). Related: Horsed; horsing. Sense of "to play excessive jokes on" is by 1893, mostly in formation horse around (1928), perhaps from horseplay.
[A] favorite pastime for many men is to "horse" or guy a friend who has shown himself susceptible to ridicule or fun making. "Horsing" is extremely wholesome mental discipline for over sensitive or super-conceited young men. "Horsing" always implies a joke at another's expense. As to how it came into use there is no satisfactory theory to offer. ["Yale Literary Magazine," December 1893]
horse sense (n.) Look up horse sense at Dictionary.com
1832, American English colloquial, from horse (n.), perhaps in referfence to the animal's qualities, or the abilites of hostlers and coachmen with the animals, perhaps from the same association of "strong, large, coarse" found in horseradish.
horse-chestnut (n.) Look up horse-chestnut at Dictionary.com
1590s, from horse + chestnut. A tree probably native to Asia, introduced in England c. 1550; the name also was extended to similar North American species such as the buckeye. Said to have been so called because it was food for horses. The nut resembles that of the edible chestnut but is bitter to the taste.
horse-race (n.) Look up horse-race at Dictionary.com
also horserace, 1580s, from horse (n.) + race (n.1).
horse-whip (n.) Look up horse-whip at Dictionary.com
1690s, from horse (n.) + whip (n.). As a verb from 1768. Related: Horserwhipped; horsewhipping.
horseback (n.) Look up horseback at Dictionary.com
late 14c., from horse (n.) + back (n.). The alternative formerly was described in jest as footback [Century Dictionary].
horsefeathers (n.) Look up horsefeathers at Dictionary.com
"nonsense," 1928, said to have been coined by U.S. cartoonist Billy De Beck; perhaps a variant of horseshit "nonsense," though the latter is attested only from 1940s.
horsefly (n.) Look up horsefly at Dictionary.com
late 14c., from horse (n.) + fly (n.).
horsehair (n.) Look up horsehair at Dictionary.com
late 14c., from horse (n.) + hair.
horsehide Look up horsehide at Dictionary.com
early 14c., from horse (n.) + hide (n.).
horseman (n.) Look up horseman at Dictionary.com
c. 1200, from horse (n.) + man (n.).
horsemanship (n.) Look up horsemanship at Dictionary.com
1560s, from horseman + -ship.
horseplay (n.) Look up horseplay at Dictionary.com
"rough, excessive play," 1580s, from horse (n.) with its associations of "strong, coarse" + play (n.).
horsepower (n.) Look up horsepower at Dictionary.com
1806, from horse (n.) + power (n.); established by Watt as the power needed to lift 33,000 pounds one foot in one minute, which is actually about 1.5 times the power of a strong horse.
horseradish (n.) Look up horseradish at Dictionary.com
1590s, Cochlearia armoricia; the common name preserves the once-common figurative sense of horse as "strong, large, coarse" (as in in obsolete horse mushroom, horse parsley, Old English horsminte "horse mint," etc.); also see radish.
horseshoe (n.) Look up horseshoe at Dictionary.com
late 14c. (early 13c. as a proper name), from horse (n.) + shoe (n.). Horseshoes as another name for the game of quoits, attested by 1822.
HORSE-SHOES, the game of coits, or quoits--because sometimes actually played with horse-shoes. [John Trotter Brockett, "A Glossary of North Country Words," 1829]
The belief that finding a horseshoe by chance is lucky is attested from late 14c., and the practice of nailing one above a doorway to prevent a witch entering therein was common in London down to c. 1800. Of a type of bend in a river, 1770, American English. As a type of crab, from 1775.
horsetail (n.) Look up horsetail at Dictionary.com
c. 1400, from horse (n.) + tail (n.). As a kind of plant, from 1530s.
horsewoman (n.) Look up horsewoman at Dictionary.com
1560s, from horse (n.) + woman. See horseman.
horsy (adj.) Look up horsy at Dictionary.com
1590s, from horse (n.) + -y (2). Related: Horsiness.
hortative (adj.) Look up hortative at Dictionary.com
c. 1600, from Latin hortativus, from past participle stem of hortari “to exhort” (see hortatory).
hortatory (adj.) Look up hortatory at Dictionary.com
1580s, from Middle French hortatoire and directly from Late Latin hortatorius "encouraging, cheering," from hortatus, past participle of hortari "exhort, encourage, urge, incite, instigate," intensive of horiri "urge, incite, encourage," from PIE root *gher- (5) "to like, want" (cognates: Old English giernan "to strive, desire, yearn;" Gothic gairnei "desire;" Greek khresthai "to lack, want; use, make use of," kharis "grace, favor," khairein "to rejoice, delight in;" Sanskrit haryati "finds pleasure, likes," harsate "is aroused;" Avestan zara "effort, aim;" Russian zhariti "awake desire, charm").
Hortense Look up Hortense at Dictionary.com
fem. proper name, from Latin Hortensia, fem. of Hortensius, a Roman gens name, related to hortus "garden" (see yard (n.1)).
horticultural (adj.) Look up horticultural at Dictionary.com
1778, from horticulture + -al (1).
horticulture (n.) Look up horticulture at Dictionary.com
1670s, "cultivation of a garden," fabricated from Latin hortus "garden" (see yard (n.1)) + cultura (see culture); probably on model of agriculture. Famously punned upon by Dorothy Parker.
horticulturist (n.) Look up horticulturist at Dictionary.com
1818, from horticulture + -ist. Earlier was horticultist (1754).
Horus Look up Horus at Dictionary.com
1851, Egyptian hawk-headed god, from Latin Horus, from Egyptian Hor, literally "the high-flying one."
hosanna Look up hosanna at Dictionary.com
Old English osanna, via Latin and Greek from Hebrew hosha'na, probably a shortening of hoshi'ah-nna "save, we pray" (see Psalms cxviii:25), from imperative of y-sh- (compare yeshua "salvation, deliverance, welfare") + emphatic particle -na. Originally an appeal for deliverance; used in Christian Church as an ascription of praise, because when Jesus entered Jerusalem this was shouted by Galilean pilgrims in recognition of his messiahhood (Matt. xxi:9, 15, etc.).
hose (v.) Look up hose at Dictionary.com
c. 1300, "to furnish with stockings," from hose (n.). Meaning "to water down with a hose" is from 1889. Related: Hosed; hosing.
hose (n.) Look up hose at Dictionary.com
late Old English, hosa "covering for the leg," from Proto-Germanic *husan (cognates: Old Saxon, Old Norse hosa, Middle High German hose "covering for the leg," German Hose "trousers"), literally "covering," from PIE *(s)keu- "to cover, conceal" (see hide (n.1)). Old French hose, Old Spanish huesa are of Germanic origin. Sense of "flexible rubber tube for liquid" is first attested late 15c.
Hosea Look up Hosea at Dictionary.com
masc. proper name, from Hebrew Hoshea, literally "salvation," from stem y-sh- "to save."
hoser (n.) Look up hoser at Dictionary.com
"contemptible person," also hose-head, by 1982, a term popularized by the Canadian parody comic sketch "Great White North" with the fictional McKenzie Brothers on SCTV.