monstrous predatory bird of Arabian mythology, 1570s, from Arabic rukhkh, from Persian rukh. It is mentioned in Marco Polo's account of Madagascar; according to OED, modern use of the word mostly is due to translations of the "Arabian Nights" tales. Hence roc's egg "something marvelous or prodigious." Compare simurgh.
Old English ecg "corner, edge, point," also "sword" (also found in ecgplega, literally "edge play," ecghete, literally "edge hate," both used poetically for "battle"), from Proto-Germanic *agjo (source also of Old Frisian egg "edge;" Old Saxon eggia "point, edge;" Middle Dutch egghe, Dutch eg; Old Norse egg, see egg (v.); Old High German ecka, German Eck "corner"), from PIE root *ak- "be sharp, rise (out) to a point, pierce."
Spelling development of Old English -cg to Middle English -gg to Modern English -dge represents a widespread shift in pronunciation. To get the edge on (someone) is U.S. colloquial, first recorded 1911. Edge city is from Joel Garreau's 1992 book of that name. Razor's edge as a perilous narrow path translates Greek epi xyrou akmes. To be on edge "excited or irritable" is from 1872; to have (one's) teeth on edge is from late 14c., though "It is not quite clear what is the precise notion originally expressed in this phrase" [OED].
"sikly envelop which the larvae of many insects spin as a covering while they are in the crysalis state," 1690s, from French coucon (16c., Modern French cocon), from coque "clam shell, egg shell, nut shell," from Old French coque "shell," from Latin coccum "berry," from Greek kokkos "berry, seed" (see cocco-). The sense of "one's interior comfort place" is from 1986. Also see -oon.
"strong, stimulating, cold American drink," first attested 1806; H.L. Mencken lists seven versions of its origin, perhaps the most durable traces it to French coquetier "egg-cup" (15c.; in English cocktay). In New Orleans, c. 1795, Antoine Amédée Peychaud, an apothecary (and inventor of Peychaud bitters) held Masonic social gatherings at his pharmacy, where he mixed brandy toddies with his own bitters and served them in an egg-cup. On this theory, the drink took the name of the cup.
Ayto ("Diner's Dictionary") derives it from cocktail "horse with a docked tail" (one cut short, which makes it stand up somewhat like a cock's comb) because such a method of dressing the tail was given to ordinary horses, the word came to be extended to "horse of mixed pedigree" (not a thoroughbred) by 1800, and this, it is surmised, was extended to the drink on the notion of "adulteration, mixture."
Used from 1920s of any mix of substances (fruit, Molotov). Cocktail party attested by 1907.