cooler (n.) Look up cooler at Dictionary.com
1570s, "a vessel in which something is set to cool," agent noun from cool (v.). Meaning "insulated box to keep things cool" is from 1958. Slang meaning "jail" is attested from 1884.
coolie (n.) Look up coolie at Dictionary.com
name given by Europeans to hired laborers in India and China, c.1600, from Hindi quli "hired servant," probably from kuli, name of an aboriginal tribe or caste in Gujarat. The name was picked up by the Portuguese, who used it in southern India (where by coincidence kuli in Tamil meant "hire") and in China.
coolness (n.) Look up coolness at Dictionary.com
Old English colnesse; see cool (adj.) + -ness. Figurative sense of "calmness" is from 1650s; that of "absence of warm affection" is from 1670s.
coolth (n.) Look up coolth at Dictionary.com
1540s, from cool on the model of warmth. It persists, and was used by Pound, Tolkien, Kipling, etc., but it never has shaken its odor of facetiousness and become standard.
coomb (n.) Look up coomb at Dictionary.com
also combe, "deep hollow or valley, especially on flank of a hill," mainly surviving in place names, from Old English cumb, probably a British word, from Celtic base *kumbos (compare Welsh cwm in same sense). Cambridge Dictionary of English Place-Names says, "This is usually taken to be a Celtic loan ... but there was also OE cumb 'vessel, cup, bowl,'" which was "probably used in a transferred topographical sense reinforced in western districts by cwm."
coon (n.) Look up coon at Dictionary.com
short for raccoon, 1742, American English. It was the nickname of Whig Party members in U.S. c.1848-60, as the raccoon was the party's symbol, and it also had associations with frontiersmen (who stereotypically wore raccoon-skin caps), which probably ultimately was the source of the Whig Party sense (the party's 1840 campaign was built on a false image of wealthy William Henry Harrison as a rustic frontiersman).

The insulting U.S. meaning "black person" was in use by 1837, said to be ultimately from Portuguese barracoos "building constructed to hold slaves for sale." No doubt boosted by the enormously popular blackface minstrel act "Zip Coon" (George Washington Dixon) which debuted in New York City in 1834. But it is perhaps older (one of the lead characters in the 1767 colonial comic opera "The Disappointment" is a black man named Raccoon). Coon's age is 1843, American English, probably an alteration of British a crow's age.
coop (n.) Look up coop at Dictionary.com
"small cage for poultry," mid-14c., from Old English cype, cypa "basket, cask," akin to Middle Dutch kupe, Swedish kupa, and all probably from Latin cupa "tub, cask," from PIE *keup- "hollow mound" (see cup (n.)).
coop (v.) Look up coop at Dictionary.com
1560s, from coop (n.). Related: Cooped; cooping.
cooper (n.) Look up cooper at Dictionary.com
"craftsman who makes wooden vessels," attested from late 12c. as a surname, either from Old English (unattested) or from a Low German source akin to Middle Dutch cuper, East Frisian kuper, from Low German kupe (German Kufe) "cask," cognate with Medieval Latin cupa (see coop (n.)).
A dry cooper makes casks, etc., to hold dry goods, a wet cooper those to contain liquids, a white cooper pails, tubs, and the like for domestic or dairy use. [OED]
The surname Cowper (pronounced "cooper") preserves a 15c. spelling.
cooperate (v.) Look up cooperate at Dictionary.com
also co-operate, c.1600, from Late Latin cooperatus, past participle of cooperari "to work together with" (see cooperation). Related: Cooperated; cooperating.
cooperation (n.) Look up cooperation at Dictionary.com
late 15c., from Middle French coopération, or directly from Late Latin cooperationem (nominative cooperatio) "a working together," noun of action from past participle stem of cooperari "to work together," from com- "with" (see com-) + operari "to work" (see operation).
cooperative (adj.) Look up cooperative at Dictionary.com
also co-operative, c.1600, from Late Latin cooperat-, past participle stem of cooperari (see cooperation) + -ive. Political economy sense is from 1808, from the pre-Marx communist movement. The noun meaning "a cooperative store" is from 1883; meaning "a cooperative society" is from 1921.
coopt (v.) Look up coopt at Dictionary.com
see co-opt.
cooptation (n.) Look up cooptation at Dictionary.com
1530s, "election to fill a vacancy," from Latin cooptationem (nominative cooptatio) "election," noun of action from past participle stem of cooptare (see co-opt). Related: Cooptative.
coordinate (adj.) Look up coordinate at Dictionary.com
1640s, "of the same order," from Medieval Latin coordinatus, past participle of coordinare "to set in order, arrange" (see coordination). Meaning "involving coordination" is from 1769. Related: Coordinance.
coordinate (n.) Look up coordinate at Dictionary.com
1823, in the mathematical sense, especially with reference to the system invented by Descartes; from coordinate (adj.). Hence, coordinates as a means of determining a location on the earth's surface (especially for aircraft), attested by 1960.
coordinate (v.) Look up coordinate at Dictionary.com
1660s, "to place in the same rank," from Latin coordinare (see coordination). Meaning "to arrange in proper position" (transitive) is from 1847; that of "to work together in order" (intransitive) is from 1863. Related: Coordinated; coordinating.
coordination (n.) Look up coordination at Dictionary.com
also co-ordination, c.1600, "orderly combination," from French coordination (14c.) or directly from Late Latin coordinationem (nominative coordinatio), noun of action from past participle stem of Latin coordinare "to set in order, arrange," from com- "together" (see com-) + ordinatio "arrangement," from ordo "order" (see order (n.)). Meaning "action of setting in order" is from 1640s; that of "harmonious adjustment or action," especially of muscles and bodily movements, is from 1855.
coordinator (n.) Look up coordinator at Dictionary.com
also co-ordinator, 1864, agent noun in Latin form from coordinate (v.).
coot (n.) Look up coot at Dictionary.com
c.1300, cote, used for various water fowl (now limited to Fulica atra and, in North America, F. americana), of uncertain origin. Compare Dutch meercoet "lake coot." Meaning "silly person, fool" is attested from 1766.
cooter (n.) Look up cooter at Dictionary.com
name for some types of freshwater terrapin in southern U.S., 1835 (first attested 1827 in phrase drunk as a cooter, but this probably is a colloquial form of unrelated coot), from obsolete verb coot "to copulate" (1660s), of unknown origin. The turtle is said to copulate for two weeks at a stretch.
cootie (n.) Look up cootie at Dictionary.com
"body lice," 1917, British World War I slang, earlier in nautical use, said to be from Malay kutu "dog tick."
cooties (n.) Look up cooties at Dictionary.com
1917, see cootie.
cop (v.) Look up cop at Dictionary.com
1704, northern British dialect, "to seize, to catch," perhaps ultimately from Middle French caper "seize, to take," from Latin capere "to take" (see capable); or from Dutch kapen "to take," from Old Frisian capia "to buy," which is related to Old English ceapian (see cheap). Related: Copped; copping.
cop (n.) Look up cop at Dictionary.com
"policeman," 1859, abbreviation of earlier copper (n.2), 1846, from cop (v.).
cop out Look up cop out at Dictionary.com
by 1942, noun and verb, "sneak off, escape," American English slang, probably from cop a plea (c.1925) "plead guilty to lesser charges," probably from northern British slang cop "to catch" (a scolding, etc.); as in cop a feel "grope someone" (1930s); see cop (v.). Sense of "evade an issue or problem" is from 1960s.
copacetic (adj.) Look up copacetic at Dictionary.com
1919, but it may have origins in 19c. U.S. Southern black speech. Origin unknown, suspects include Latin, Yiddish (Hebrew kol b'seder), Italian, Louisiana French (coupe-sétique), and Native American. None is considered convincing by linguists.
copasetic Look up copasetic at Dictionary.com
see copacetic.
cope (v.) Look up cope at Dictionary.com
late 14c., "come to blows with," from Old French couper, earlier colper "hit, punch," from colp "a blow" (see coup). Meaning evolved 17c. into "handle successfully," perhaps influenced by obsolete cope "to traffic" (15c.-17c.), a word in North Sea trade, from the Flemish version of the Germanic source of English cheap. Related: Coped; coping.
Copenhagen Look up Copenhagen at Dictionary.com
capital of Denmark, literally "merchant's port," from Danish køber "merchant," literally "buyer" (see cheap (adj.)), + havn "port" (see haven).
Copernican (adj.) Look up Copernican at Dictionary.com
1660s, "pertaining to Copernicus."
Copernicus Look up Copernicus at Dictionary.com
Latinized form of name of Mikolaj Koppernigk (1473-1543), physician and canon of the cathedral of Frauenburg. His great work was "De Revolutionibus Orbium Coelestium."
copesetic (adj.) Look up copesetic at Dictionary.com
see copacetic.
copier (n.) Look up copier at Dictionary.com
1590s, agent noun from copy (v.).
copilot (n.) Look up copilot at Dictionary.com
1927, from co- + pilot (n.).
coping (n.) Look up coping at Dictionary.com
c.1600 as an architectural term, from cope (n.), the cape-like vestment worn by priests (14c.), a variant of cape. Coping saw attested by 1931.
copious (adj.) Look up copious at Dictionary.com
mid-14c., from Latin copiosus "plentiful," from copia "an abundance, ample supply, profusion, plenty," from com- "with" (see com-) + ops (genitive opis) "power, wealth, resources," from PIE root *op- (1) "to work, produce in abundance," (see opus). Related: Copiously.
coplanar (adj.) Look up coplanar at Dictionary.com
1862, from co- + planar.
copout Look up copout at Dictionary.com
see cop out.
copper (n.1) Look up copper at Dictionary.com
malleable metallic element, Old English coper, from Proto-Germanic *kupar (cognates: Middle Dutch koper, Old Norse koparr, Old High German kupfar), from Late Latin cuprum, contraction of Latin Cyprium (aes) "Cyprian (metal)," after Greek Kyprios "Cyprus" (see Cyprus).

Latin aes originally was "copper," but this was extended to its alloy with tin, bronze, and as this was far more extensively used than pure copper, the word's primary sense shifted to the alloy and a new word evolved for "copper," from the Latin form of the name of the island of Cyprus, where copper was mined. Aes passed into Germanic (which originally did not distinguish copper from its alloys) and became English ore. In Latin, aes was the common word for "cash, coin, debt, wages" in many figurative expressions. Chemical symbol Cu is from cuprum.
copper (n.2) Look up copper at Dictionary.com
"policeman," 1846; agent noun from cop (v.).
copperhead (n.) Look up copperhead at Dictionary.com
Trigonocephalus contortrix, 1775, American English, so called for color markings between its eyes; see copper + head (n.). Poisonous "sneak snakes" (because they bite without warning), the name is said to have been first used in reference to Northerners suspected of Southern sympathies in Greeley's New York "Tribune," July 20, 1861. Charles H. Coleman, "The Use of the Term 'Copperhead' During the Civil War" ["Mississippi Valley Historical Review" 25 (1938), p.263] traces it to an anonymous letter against Ohio anti-war Democrats in the Cincinnati "Commercial" newspaper in the summer of 1861. It seems not to have been in widespread use until summer 1862.
coppice (n.) Look up coppice at Dictionary.com
late 14c., "small thicket of trees grown for cutting," from Old French copeiz, coupeiz "a cut-over forest," from Vulgar Latin *colpaticium "having been cut," ultimately from Latin colaphus "a blow with the fist," from Greek kolaphos "blow, cuff" (see coup).
copra (n.) Look up copra at Dictionary.com
dried kernel of coconut, 1580s, from Portuguese copra (16c.), from Malayalam koppara (cognate with Hindi khopra) "coconut;" related to Hindi khopri "skull," from Sanskrit kharparah "skull."
copro- Look up copro- at Dictionary.com
word-forming element indicating "dung, filth, excrement," before vowels copr-, from Modern Latin copro-, from Greek kopros "dung," from PIE root *kekw-. Hence, coprology "study of obscene literature."
coprolalia (n.) Look up coprolalia at Dictionary.com
"obsessive use of obscene language, either through mental illness or perversion," 1886, from French coprolalie, coined 1885 by de la Tourette, from copro- "dung, filth" + Greek lalia "talk, prattle, a speaking," from lalein "to speak, prattle," of echoic origin.
coprolite (n.) Look up coprolite at Dictionary.com
fossil dung, 1829, from copro- + -lite, from French, for -lithe, from Greek lithos "stone" (see litho-).
coprophagia (n.) Look up coprophagia at Dictionary.com
1906, in Havelock Ellis, Latinized from coprophagy (q.v.).
coprophagy (n.) Look up coprophagy at Dictionary.com
1891, from Modern Latin coprophagus, from Greek koprophagos "dung-eating," from kopros "dung" (see copro-) + -phagos (see -phagous). Related: Coprophagous.
coprophilia (n.) Look up coprophilia at Dictionary.com
"attraction to defecation and feces," 1934, from copro- + -philia.