troglodyte n.

Old English truht "trout," in part from Old French truite, both from Late Latin tructa, perhaps from Greek troktes "a kind of sea fish," literally "nibbler," from trogein "to gnaw," from PIE *tro-, from root *tere- (1) "to rub, turn." In late 17c. slang, trusty trout was used in a sense of "confidential friend."

H.L. Mencken's invented proper word for "strip-tease artist," 1940, from Greek ekdysis "a stripping or casting off" (used scientifically in English from mid-19c. with reference to serpents shedding skin and molting birds or crustacea), from ekdyein "to put off one's clothes, take off, strip off" (contrasted with endyo "to put on"), from ek (see ex-) + dyein "enter, to dive; to plunge; get into, slip into, put on," which, according to Beekes, is "related to the rare Sanskrit verb upa-du- 'to put on' ...."

"obnoxious person, boor, lout," 1956, short for troglodyte.