Online Etymology Dictionary

coil (n.): 1620s, from coil (v.). Related: Coils.
coin (n.): c.1300, "a wedge," from Old French coing (12c.) "a wedge; stamp; piece of money; corner, angle," from Latin cuneus "a wedge." The die for stamping metal was wedge-shaped, and the English word came to mean "thing stamped, a piece of money" by late 14c. (a sense that already had developed in French). Cf. quoin, which split off from this word 16c. Modern French coin is "corner, angle, nook."
coin (v.): "to coin money," mid-14c., from coin (n.). Related: Coined; coining. To coin a phrase is late 16c. A Middle English word for minter was coin-smiter.
coinage (n.): late 14c., "currency, money," from Old French coignage, from coignier "to coin" (see coin (n.)). Meaning "act or proces of coining money" is from early 15c.; sense "deliberate formation of a new word" is from 1690s, from a general sense of "something invented" (c.1600).
coincide (v.): 1715, from French coincider (14c.), from Medieval Latin coincidere (in astrological use), literally "to fall upon together," from Latin com- "together" (see co-) + incidere "to fall upon" (in- "upon + cadere "to fall;" see case (n.1)). Related: Coincided; coinciding.
coincidence (n.): c.1600, "exact correspondence," from French coincidence, from coincider (see coincide). Meaning "a concurrence of events with no apparent connection" is from 1680s.
coincident (adj.): late 16c., from French coincident, from coincider (see coincide).
coincidental (adj.): c.1800, from coincident + -al (1).
coincidentally (adv.): 1837, from coincidental + -ly (2).
coincidently: 1620s, from coincident + -ly (2).
Cointreau (n.): orange-flavored liqueur, named for founders Adolphe and Edouard-Jean Cointreau, brothers from Angers, France, who set up Cointreau Distillery in 1849. The orange liqueur dates from 1875.
coir (n.): "prepared coconut fiber," 1580s, from Malayalam kayar "cord," from kayaru "to be twisted."
coit (n.): "coition," 1670s, from Latin coitus "going together," also "coition," from coire "to go together" (see coitus).
coition (n.): 1540s, "going together, coming together," from Late Latin coitionem (nominative coitio), noun of action from coitus, past participle of coire "to go together, come together" (see coitus). Meaning "sexual copulation" is attested in English from 1610s.
coitus (n.): "copulation," 1713, scientific Latin, from Latin coitus "a meeting together; sexual union," past participle of coire, from com- "together" (see co-) + ire "come, go," (see ion). In Middle English as coite (early 15c.). Used in English in general senses of "meeting, uniting," and also of magnetic force, planetary conjunction, etc., before sexual sense came to predominate.
coitus interruptus (n.): 1900, first attested in Havelock Ellis.
cojones (n.): "courage," literally "balls," 1932, from Spanish cojon "testicle," from Latin coleus, culleus (source of Italian coglione), literally "a leather sack," related to Greek koleos "sheath, scabbard (see cell). In English, first attested in Hemingway.
coke (n.2): shortened form of cocaine, 1908, American English.
coke (n.1): "residue of fuel," 1690s, northern English dialect, perhaps a variant of Middle English colke "core, charcoal" (c.1400), itself possibly related to -colc, an Old English word for "pit," which perhaps would give it a sense of "what is left in the pit after a fire."
Coke: soft drink, 1909, shortening of brand name Coca-Cola.
col-: form of Latin com- before stems beginning in -l- (see com-).
cola (n.): 1795, genus of trees native to west Africa and introduced in New World tropics, Latinized form of a West African name of the tree (cf. Temne kola, Mandingo kolo). Meaning "carbonated soft drink" is 1920, short for Coca-Cola, Pepsi-Cola.
colander (n.): mid-14c., coloundour, probably altered from Medieval Latin colatorium "strainer" (with parasitic -n-) from Latin colatus, past participle of colare "to strain," from colum "sieve, strainer, wicker fishing net," of uncertain origin. Cognate with French couloir, Spanish colador, Italian colatojo.
cold (adj.): Old English cald (Anglian), ceald (West Saxon) "cold, cool" (adj.), "coldness," from Proto-Germanic *kaldaz (cf. Old Frisian and Old Saxon kald, Old High German and German kalt, Old Norse kaldr, Gothic kalds "cold"), possibly a past participle adjective of *kal-/*kol-, from PIE root *gel-/*gol- "cold" (cf. Latin gelare "to freeze," gelu "frost," glacies "ice").

Meaning "not strong" (in reference to scent) is 1590s, from hunting. Cold front in weather is from 1921. Cold-call in the sales pitch sense first recorded 1972. Japanese has two words for "cold:" samui for coldness in the atmosphere or environment; tsumetai for things which are cold to touch, and also in the figurative sense, with reference to personalities, behaviors, etc.
cold (n.): c.1300, "coldness," from cold (adj.). Sense in common cold is 1530s, from symptoms resembling those of exposure to cold; cf. earlier senses "indisposition caused by exposure to cold" (early 14c.); "discomfort caused by cold" (c.1300).
cold blooded (adj.): also cold-blooded; 1590s, of persons, "without emotion, unfeeling;" of actions, from 1828. The phrase refers to the old notion that blood temperature rose with excitement. In the literal sense, of reptiles, etc., from c.1600.
cold feet (n.): 1893, American English; the presumed Italian original (avegh minga frecc i pee) is a Lombard proverb meaning "to have no money," but some of the earliest English usages refer to gamblers, so a connection is possible.
cold shoulder (n.): 1816, in the figurative sense of "icy reception," first in Sir Walter Scott, probably originally a literal figure, but commonly used with a punning reference to "cold shoulder of mutton," considered a poor man's dish and thus, perhaps, something one would set out for an unwanted guest with deliberate intention to convey displeasure.
How often have we admired the poor knight, who, to avoid the snares of bribery and dependence, was found making a second dinner from a cold shoulder of mutton, above the most affluent courtier, who had sold himself to others for a splendid pension! ["No Fiction," 1820]
cold turkey: "without preparation," 1910; narrower sense of "withdrawal from an addictive substance" (originally heroin) first recorded 1921. Cold turkey is a food that requires little preparation, so "to quit like cold turkey" is to do so suddenly and without preparation. Cf. cold shoulder.
cold war: used in print October 1945 by George Orwell; popularized in U.S. c.1947 by Bernard Baruch.
More than any other time in history, mankind faces a crossroads. One path leads to despair and utter hopelessness. The other, to total extinction. Let us pray we have the wisdom to choose correctly. [Woody Allen, "My Speech to the Graduates," 1979]
cold-hearted (adj.): c.1600, from cold (adj.) + hearted. Originally in Shakespeare. Old English had cealdheort (adj.) "cruel."
cole (n.): "cabbage," late Old English cawel, perhaps via Old Norse kal, from Latin caulis "stem, stalk, cabbage" (source of Italian cavolo, Spanish col, Old French chol, French chou; also borrowed elsewhere in Germanic, e.g. Swedish kal, Danish kaal, German kohl, Dutch kool).
colectomy (n.): 1882, from colon (n.2) + -ectomy.
coleoptera (n.): 1763, from Modern Latin, from Greek koleopteros, literally "sheath-wing," used by Aristotle to describe beetles, from koleos "sheath" (see cell) + pteron "wing" (see pterodactyl). Related: Coleopterous.
coleslaw (n.): also cole-slaw, cole slaw, 1794, American English, partial translation of Dutch koolsla, from kool "cabbage" (see cole) + sla "salad" (see slaw). Commonly cold slaw in English until 1860s, when Middle English cole "cabbage" was revived.
colic (n.): "disease characterized by severe abdominal pain," early 15c., from Late Latin colicus "pertaining to colic," from Greek kolikos, belonging to the kolon "lower intestine" (see colon (n.2)). The word was used in English late 14c. as an adjective, "affecting the colon." Related: Colicky (1742).
coliform (adj.): 1850s, "resembling a sieve," from Latin colum "strainer;" meaning "resembling a bacillus of the coli group" is from 1906, from coli + form.
Colin: masc. proper name, from French Colin, a diminutive of Col, itself a diminutive of Nicolas. A common shepherd's name in pastoral verse.
coliseum (n.): "music hall," c.1710, Modern Latin variant of Latin colosseum, amphitheater of Vespasian at Rome (see Colosseum).
colitis (n.): 1860, from comb. form of colon (n.2) + -itis.
collaborate (v.): 1871, back-formation from collaborator. Given a bad sense in World War II. Related: Collaborated; collaborating.
collaboration (n.): 1860, from French collaboration, noun of action from Latin collaborare (see collaborate). In a bad sense, "tratorious cooperation with an occupying enemy," it is recorded from 1940; earliest references are to the Vichy Government of France.
collaborator (n.): 1802, from French collaborateur, from Latin collaboratus, past participle of collaborare "work with," from com- "with" (see com-) + labore "to work" (see labor (v.)).
collage (n.): 1919, from French collage "a pasting," from Old French coller "to glue," from Greek kolla "glue." Earliest reference is in Wyndham Lewis.
collagen (n.): structural protein of connective tissue, 1843, from French collagène, from Greek kolla "glue" + -gen "giving birth to" (see -gen).
collapsable (adj.): 1843, from collapse (v.) + -able.
collapse (v.): 1732, from Latin collapsus, past participle of collabi "fall together," from com- "together" (see com-) + labi "to fall, slip" (see lapse (n.)). The adjective collapsed is attested from c.1600, from Latin collapsus, and perhaps this suggested a verb. Related: Collapsing.
collapse (n.): 1801, from collapse (v.).
collapsible (adj.): 1875, alternative spelling of collapsable.
collar (n.): c.1300, "neck armor, gorget," from Old French coler "neck, collar" (12c., Modern French collier), from Latin collare "necklace, band or chain for the neck," from collum "the neck," from PIE *kwol-o- "neck" (cf. Old Norse and Middle Dutch hals "neck"), literally "that on which the head turns," from root *kwel- "move round, turn about" (see cycle (n.)). Late 14c. as "border at the neck of a garment."