longhand (adj.) Look up longhand at Dictionary.com
also long-hand, of handwriting, 1660s, from long (adj.) + hand (n.).
longhorn (adj.) Look up longhorn at Dictionary.com
also long-horn, in reference to a type of cattle, 1808, from long (adj.) + horn (n.).
longi- Look up longi- at Dictionary.com
word-forming element meaning "long," from Latin longi-, comb. form of longus (see long (adj.)).
longing (n.) Look up longing at Dictionary.com
"yearning, desire," Old English langung "longing, weariness, sadness, dejection," from long (v.). Related: Longingly.
longinquity (n.) Look up longinquity at Dictionary.com
"remoteness," 1540s, from Latin longinquitas "length, extent, duration," from longinquus "long, extensive, remote, distant," from longus (see long (adj.)) -inquus.
longish (adj.) Look up longish at Dictionary.com
1610s, from long (adj.) + -ish.
longitude (n.) Look up longitude at Dictionary.com
late 14c., "length," from Latin longitudo "length, duration," from longus (see long (adj.)). For origins, see latitude.
longitudinal (adj.) Look up longitudinal at Dictionary.com
1706, from Latin longitudo (see longitude) + -al (1).
longship (n.) Look up longship at Dictionary.com
Old English langscip "man of war;" see long (adj.) + ship (n.).
longshoreman (n.) Look up longshoreman at Dictionary.com
1811, shortening of alongshore + man (n.).
longstanding Look up longstanding at Dictionary.com
also long-standing, c. 1600 (n.), 1814 (adj.), from long (adj.) + standing.
longtime (adj.) Look up longtime at Dictionary.com
also long-time, 1580s, from long (adj.) + time (n.).
longways (adv.) Look up longways at Dictionary.com
1580s, from long (adj.) + way (n.) + adverbial genitive -s.
loo (n.1) Look up loo at Dictionary.com
"lavatory," 1940, but perhaps 1922, probably from French lieux d'aisances, "lavatory," literally "place of ease," picked up by British servicemen in France during World War I. Or possibly a pun on Waterloo, based on water closet.
loo (n.2) Look up loo at Dictionary.com
type of card game, 1670s, short for lanterloo (1660s), from French lanturelu, originally (1620s) the refrain of a popular comic song; according to French sources the refrain expresses a mocking refusal or an evasive answer and was formed on the older word for a type of song chorus, turelure; apparently a jingling reduplication of loure "bagpipe" (perhaps from Latin lura "bag, purse").
From its primary signification -- a kind of bagpipe inflated from the mouth -- the word 'loure' came to mean an old dance, in slower rhythm than the gigue, generally in 6-4 time. As this was danced to the nasal tones of the 'loure,' the term 'loure' was gradually applied to any passage meant to be played in the style of the old bagpipe airs. ["Grove's Dictionary of Music and Musicians," London, 1906]
The refrain sometimes is met in English as turra-lurra.
looey (n.) Look up looey at Dictionary.com
1916, American English, colloquial familiar form of lieutenant.
loof (n.) Look up loof at Dictionary.com
"palm of the hand," Scottish and Northern English, c. 1300, from Old Norse lofe, cognate with Gothic lofa, Russian lapa "paw," Lettish lepa "paw."
loofah (n.) Look up loofah at Dictionary.com
1879, from Egyptian Arabic lufah, the name of the plant (Luffa ægyptiaca) with fibrous pods from which flesh-brushes are made.
loogie (n.) Look up loogie at Dictionary.com
"nasal mucus," U.S. slang, by 1990.
look (v.) Look up look at Dictionary.com
Old English locian "use the eyes for seeing, gaze, look, behold, spy," from West Germanic *lokjan (source also of Old Saxon lokon "see, look, spy," Middle Dutch loeken "to look," Old High German luogen, German dialectal lugen "to look out"), of unknown origin, perhaps cognate with Breton lagud "eye." In Old English, usually with on; the use of at began 14c. Meaning "seek, search out" is c. 1300; meaning "to have a certain appearance" is from c. 1400. Of objects, "to face in a certain direction," late 14c.

Look after "take care of" is from late 14c., earlier "to seek" (c. 1300), "to look toward" (c. 1200). Look into "investigate" is from 1580s; look up "research in books or papers" is from 1690s. To look down upon in the figurative sense is from 1711; to look down one's nose is from 1921. To look forward "anticipate" is c. 1600; meaning "anticipate with pleasure" is mid-19c. To not look back "make no pauses" is colloquial, first attested 1893. In look sharp (1711) sharp originally was an adverb, "sharply."
look (n.) Look up look at Dictionary.com
c. 1200, "act or action of looking," from look (v.). Meaning "appearance of a person" is from late 14c. Expression if looks could kill ... attested by 1827 (if looks could bite is attested from 1747).
look-alike (n.) Look up look-alike at Dictionary.com
"someone who closely resembles another," 1937, American English, from look (v.) + alike.
look-down (n.) Look up look-down at Dictionary.com
type of sea fish, 1882, from look (v.) + down (adv.). So called from facial structure.
look-see (n.) Look up look-see at Dictionary.com
"inspection," 1865, "Pidgin-like formation" [OED], and first used in representations of English as spoken by Chinese, from look (v.) + see (v.).
looker (n.) Look up looker at Dictionary.com
Old English locere "one engaged in looking," agent noun from look (v.). Meaning "one who watches over" is from c. 1300; that of "one who has a certain appearance" is late 15c. Slang meaning "attractive woman" attested from 1893; good-looker is attested from 1866 of both women and horses. Looker-in (1927) was an early word for "television viewer."
looking-glass (n.) Look up looking-glass at Dictionary.com
1520s, from looking, present participle adjective from look (v.) + glass (n.).
lookout (n.) Look up lookout at Dictionary.com
also look-out, "person who stands watch or acts as a scout," 1690s, from look + out. Verbal phrase look out "be on the watch" attested from c. 1600.
loom (n.) Look up loom at Dictionary.com
weaving machine, Old English geloma "utensil, tool," from ge-, perfective prefix, + -loma, of unknown origin (compare Old English andloman (plural) "apparatus, furniture"). Originally "implement or tool of any kind" (as in heirloom); thus, "the penis" (c. 1400-1600). Specific meaning "a machine in which yarn or thread is woven into fabric" is from c. 1400.
loom (v.) Look up loom at Dictionary.com
1540s, "to come into view largely and indistinctly," perhaps from a Scandinavian source (compare dialectal Swedish loma, East Frisian lomen "move slowly"), perhaps a variant from the root of lame (adj.). Early used also of ships moving up and down. Figurative use from 1590s. Related: Loomed; looming.
loon (n.1) Look up loon at Dictionary.com
large diving bird (especially the Great Northern Diver), 1630s, from a Scandinavian source (compare Norwegian lom, from Old Norse lomr).
loon (n.2) Look up loon at Dictionary.com
"crazy person," mid-15c., lowen "rascal," of uncertain origin, perhaps related to Dutch loen "stupid person."
loony (adj.) Look up loony at Dictionary.com
also loonie, looney, 1853, American English, short for lunatic, but also influenced by loon (n.2) and perhaps loon (n.1), the bird being noted for its wild cry and method of escaping from danger. As a noun by 1884, from the adjective. Slang loony bin "insane asylum" is from 1919. Looney left in reference to holders of political views felt to be left-wing in the extreme is from 1977. Looney Tunes, Warner Bros. studios' animated cartoon series, dates from 1930.
loop (n.) Look up loop at Dictionary.com
late 14c., "loop of cloth, rope, leather, etc.," probably of Celtic origin (compare Gaelic lub "bend," Irish lubiam), influenced by or blended with Old Norse hlaup "a leap, run" (see leap (v.)). In reference to magnetic recording tape or film, first recorded 1931. Computer programming sense first attested 1947.
loop (v.) Look up loop at Dictionary.com
"to form a loop," c. 1400, "draw (a leash through a ring)," from loop (n.). Related: Looped; looping. Slang looped "drunk" is from 1934. Loop the loop (1900) originally was in reference to roller-coasters at amusement parks.
"Loop-the-Loop" is the name of a new entertainment which goes further in the way of tempting Providence than anything yet invented. The "Loop" is an immense circle of track in the air. A car on a mimic railway shoots down a very steep incline, and is impelled around the inner side of this loop. ... The authorities at Coney Island are said to have prohibited "looping-the-loop" because women break their corset strings in their efforts to catch their breath as they sweep down the incline, and moreover, a young man is reported to have ruptured a blood vessel in his liver. ["Philadelphia Medical Journal," Aug. 10, 1901]
loophole (n.) Look up loophole at Dictionary.com
also loop-hole, mid-15c., from Middle English loupe "opening in a wall" for shooting through or admitting light (c. 1300), perhaps related to Middle Dutch lupen "to watch, peer;" + hole (n.). Figurative sense of "outlet, means of escape" is from 1660s.
loopy (adj.) Look up loopy at Dictionary.com
"full of loops," 1856, from loop + -y (2). Slang sense "crazy" is attested from 1923. Earlier figurative sense was "cunning, deceitful" (by 1825).
loose (adj.) Look up loose at Dictionary.com
early 13c., "not securely fixed;" c. 1300, "unbound," from Old Norse lauss "loose, free, vacant, dissolute," cognate with Old English leas "devoid of, false, feigned, incorrect," from Proto-Germanic *lausaz (source also of Danish løs "loose, untied," Swedish lös "loose, movable, detached," Middle Dutch, German los "loose, free," Gothic laus "empty, vain"), from PIE *leu- "to loosen, divide, cut apart" (see lose). Meaning "not clinging, slack" is mid-15c. Meaning "not bundled" is late 15c. Sense of "unchaste, immoral" is recorded from late 15c. Meaning "at liberty, free from obligation" is 1550s. Sense of "rambling, disconnected" is from 1680s. Figurative sense of loose cannon was in use by 1896, probably from celebrated image in a popular story by Hugo:
You can reason with a bull dog, astonish a bull, fascinate a boa, frighten a tiger, soften a lion; no resource with such a monster as a loose cannon. You cannot kill it, it is dead; and at the same time it lives. It lives with a sinister life which comes from the infinite. It is moved by the ship, which is moved by the sea, which is moved by the wind. This exterminator is a plaything. [Victor Hugo, "Ninety Three"]
Loose end in reference to something unfinished, undecided, unguarded is from 1540s; to be at loose ends is from 1807. Phrase on the loose "free, unrestrained" is from 1749 (upon the loose).
loose (v.) Look up loose at Dictionary.com
early 13c, "to set free," from loose (adj.). Meaning "to undo, untie, unfasten" is 14c. Related: Loosed; loosing.
loose-leaf (adj.) Look up loose-leaf at Dictionary.com
1899, from loose (adj.) + leaf (n.).
loosely (adv.) Look up loosely at Dictionary.com
late 14c., from loose (adj.) + -ly (2).
loosen (v.) Look up loosen at Dictionary.com
late 14c., losnen, later lousen (early 15c.), from loose (v.) + -en (1). Related: Loosened; loosening.
looseness (n.) Look up looseness at Dictionary.com
c. 1400, from loose (adj.) + -ness.
loot (n.) Look up loot at Dictionary.com
"goods taken from an enemy, etc.," 1788, Anglo-Indian, from Hindi lut, from Sanskrit loptram, lotram "booty, stolen property," from PIE *roup-tro-, from root *reup- "to snatch" (see rip (v.)). The verb is first attested 1821, from the noun. Related: Looted; looting.
looter (n.) Look up looter at Dictionary.com
1858, agent noun from loot (v.).
looting (n.) Look up looting at Dictionary.com
1842, verbal noun from loot (v.).
lop (v.1) Look up lop at Dictionary.com
"cut off," 1510s, from Middle English loppe (n.) "small branches and twigs trimmed from trees" (early 15c.), of unknown origin. Related: Lopped (mid-15c.); lopping. Place name Loppedthorn is attested from 1287.
lop (v.2) Look up lop at Dictionary.com
"droop, hang loosely," 1570s, probably a variant of lob or of lap (v.); compare lopsided (1711), originally lapsided, first used of ships. Lop-eared attested from 1680s. Related: Lopped; lopping.
lope (v.) Look up lope at Dictionary.com
"to run with long strides," early 15c.; earlier "to leap, jump, spring" (c. 1300), from Old Norse hlaupa "to run, leap," from Proto-Germanic *hlaupan (see leap (v.)). Related: Loped; loping. The noun meaning "a jump, a leap" is from late 14c.; sense of "long, bounding stride" is from 1809.
lopsided (adj.) Look up lopsided at Dictionary.com
also lop-sided, 1711, originally lapsided, first used of ships; from lop (v.2) + side (n.). Related: Lopsidedly; lopsidedness.
loquacious (adj.) Look up loquacious at Dictionary.com
1660s, back-formation from loquacity or else formed from stem of Latin loquax (genitive loquacis) "talkative," from loqui "to speak" (see locution) + -ous. Related: Loquaciously; loquaciousness.