英语词源字典 - 在线词源网站

longitudinal (adj.)[longitudinal 词源字典]: 1706, from Latin longitudo (see longitude) + -al (1).[longitudinal etymology, longitudinal origin, 英语词源]
longship (n.): Old English langscip "man of war;" see long (adj.) + ship (n.).
longshoreman (n.): 1811, shortening of alongshore + man (n.).
longstanding: also long-standing, c. 1600 (n.), 1814 (adj.), from long (adj.) + standing.
longtime (adj.): also long-time, 1580s, from long (adj.) + time (n.).
longways (adv.): 1580s, from long (adj.) + way (n.) + adverbial genitive -s.
loo (n.1): "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): 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.): 1916, American English, colloquial familiar form of lieutenant.
loof (n.): "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.): 1879, from Egyptian Arabic lufah, the name of the plant (Luffa ægyptiaca) with fibrous pods from which flesh-brushes are made.
loogie (n.): "nasal mucus," U.S. slang, by 1990.
look (v.): Old English locian "use the eyes for seeing, gaze, look, behold, spy," from West Germanic *lokjan (cognates: 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.): 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.): "someone who closely resembles another," 1937, American English, from look (v.) + alike.
look-down (n.): type of sea fish, 1882, from look (v.) + down (adv.). So called from facial structure.
look-see (n.): "inspection," 1865, "Pidgin-like formation" [OED], and first used in representations of English as spoken by Chinese, from look (v.) + see (v.).
looker (n.): 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.): 1520s, from looking, present participle adjective from look (v.) + glass (n.).
lookout (n.): 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.