Etymology
peacock (n.)

c. 1300, poucock, po-cok, "bird of the genus Pavo," especially an adult male, from Middle English po "peacock" + coc (see cock (n.)). Po is from Old English pawa "peafowl" (cock or hen), from Latin pavo (genitive pavonis), which, with Greek taos is said to be ultimately from Tamil tokei, but perhaps it is imitative: Latin represented the peacock's sound as paupulo. The Latin word also is the source of Old High German pfawo, German Pfau, Dutch pauw, Old Church Slavonic pavu. Middle English also had poun "peacock" from Old French paon.

Noted for its strutting gait, imposing magnificence, and the ostentatious displays of its beautiful tail, the peacock in his pride is one with his tail fully displayed. Used as the type of a vainglorious person from mid-14c. (proud as a po). Its flesh superstitiously was believed to be incorruptible (even St. Augustine credits this). "When he sees his feet, he screams wildly, thinking that they are not in keeping with the rest of his body" [Epiphanus]. As a southern constellation from 1674.

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chicken (n.)

Old English cicen (plural cicenu) "young of the domestic hen, the young of any bird;" by early Middle English, "any chicken," regardless of age, from Proto-Germanic *kiukinam (source also of Middle Dutch kiekijen, Dutch kieken, Old Norse kjuklingr, Swedish kyckling, German Küken "chicken"), from root *keuk- (echoic of the bird's sound and possibly also the root of cock (n.1)) + diminutive suffixes. By regular sound changes it should have become Modern English *chichen; the reason it didn't is unknown.

 Generic words for "chicken" in Indo-European tend to be extended uses of "hen" words, as hens are more numerous than cocks among domestic fowl, but occasionally they are from words for the young, as in English and in Latin (pullus). Meaning "one who is cowardly or timorous" is from 1610s; adjectival sense of "cowardly" is at least as old as 14c. (compare hen-herte "a chicken-hearted person," mid-15c.). As the name of a game of danger to test courage, it is first recorded 1953.

Chicken-feed "paltry sum of money" is by 1897, American English slang; literal use (it is made from the from lowest quality of grain) is by 1834. Chicken lobster "small lobster," is by 1947, American English, apparently from chicken in its sense of "young." To count (one's) chickens before they hatch "anticipate too confidently the obtaining or doing of something" is from 1570s. Chicken-fried steak (1937) is a U.S. Southern recipe that batters, breads, and fries a thin strip of steak in the way fried chicken typically is made.

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alectryomachy (n.)
also alectoromachy, "cock-fighting," 1650s, from Latinized form of Greek alektryon "cock" (see alectryomancy) + -machy.
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cockroach (n.)

popular name of a troublesome, voracious insect genus, 1620s, folk etymology (as if from cock (n.1) + roach; compare cockchafer) of Spanish cucaracha "chafer, beetle," from cuca "kind of caterpillar." Folk etymology also holds that the first element is from caca "excrement," perhaps because of the insect's offensive smell.

A certaine India Bug, called by the Spaniards a Cacarootch, the which creeping into Chests they eat and defile with their ill-sented dung [Capt. John Smith, "Virginia," 1624].
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cockatrice (n.)

fabulous monster, late 14c., from Old French cocatriz, altered (by influence of coq) from Late Latin *calcatrix, from Latin calcare "to tread" (from calx (1) "heel;" see calcaneus), as translation of Greek ikhneumon, literally "tracker, tracer." It was fabled to kill by its glance and could be slain only by tricking it into seeing its own reflection.

In classical writings, an Egyptian animal of some sort, the mortal enemy of the crocodile, which it tracks down and kills. This vague sense became hopelessly confused in the Christian West, and in England the word ended up applied to the equivalent of the basilisk. Popularly associated with cock (n.1), hence the fable that it was a serpent hatched from a cock's egg. It also sometimes was confused with the crocodile. Belief in them persisted even among the educated because the word was used in the KJV several times to translate a Hebrew word for "serpent." In heraldry, a beast half cock, half serpent. Also, in old slang, "a loose woman" (1590s).

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cockney (n.)

"native or permanent resident of London," specifically the City of London, more precisely one born or living "within the sound of Bow-Bell" (see Bow bells); c. 1600, usually said to be from Middle English cokenei, cokeney "spoiled child, milksop" (late 14c.), originally cokene-ey "cock's egg" (mid-14c.). The most likely disentangling of the etymology is to start from Old English cocena "cock's egg" -- genitive plural of coc "cock" + æg "egg" -- medieval term for "runt of a clutch" (as though "egg laid by a cock"), extended derisively c. 1520s to "town dweller," gradually narrowing thereafter to residents of a particular neighborhood in the East End of London. Liberman, however, disagrees:

Cockney, 'cock's egg,' a rare and seemingly obsolete word in Middle English, was, in all likelihood, not the etymon of ME cokeney 'milksop, simpleton; effeminate man; Londoner,' which is rather a reshaping of [Old French] acoquiné 'spoiled' (participle). However, this derivation poses some phonetic problems that have not been resolved.

The characteristic accent so called from 1890, but the speech peculiarities were noted from 17c. As an adjective in this sense, from 1630s. Related: Cockneydom; Cockneyish.

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game (adj.2)
"ready for action, unafraid, and up to the task;" probably literally "spirited as a game-cock," 1725, from game-cock "bird bred for fighting" (1670s), from game (n.) in the "sport, amusement" sense. Middle English adjectives gamesome, gamelich meant "joyful, playful, sportive."
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white feather (n.)
as a symbol of cowardice, 1785, said to be from the time when cock-fighting was respectable, and when the strain of game-cock in vogue had no white feathers, so that "having a white feather, is proof he is not of the true game breed" [Grose].
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chanticleer (n.)

"a cock," c. 1300, from Old French Chantecler (Modern French Chanteclair), quasi-proper name of the cock in medieval stories of Reynard the Fox; literally "sing-loud" or "sing-clear," from chanter "to sing" (from PIE root *kan- "to sing") + cler (see clear (adj.)). Ben Jonson makes it chant-it-clear.

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capon (n.)
"a castrated cock," late Old English capun, from Latin caponem (nominative capo) "castrated cock" (also source of French chapon, Spanish capon, Italian cappone), perhaps from a verb meaning "to strike off," from PIE root *(s)kep- "to cut" (see hatchet (n.)). Probably reinforced in Middle English by cognate Old North French capon.
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