Etymology
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Words related to quack

salve (n.)
Old English sealf "healing ointment," from West Germanic *salbo- "oily substance" (source also of Old Saxon salba, Middle Dutch salve, Dutch zalf, Old High German salba, German salbe "ointment"), from PIE *solpa-, from root *selp- "fat, butter" (source also of Greek elpos "fat, oil," Sanskrit sarpis "melted butter"). The figurative sense of "something to soothe wounded pride, etc." is from 1736.
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quacker (n.)
"a duck," 1846, agent noun from quack (v.).
canard (n.)
"absurd or fabricated story intended as an imposition," 1851, perhaps 1843, from French canard "a hoax," literally "a duck" (from Old French quanart, probably echoic of a duck's quack); said by Littré to be from the phrase vendre un canard à moitié "to half-sell a duck," thus, perhaps from some long-forgotten joke, "to cheat." But also compare quack (n.1).
quackery (n.)

"the boastful pretensions or knavish practice of a quack, particularly in medicine" [Century Dictionary], 1690s, from quack (n.1) + -ery.

quacksalver (n.)

"one who boasts of skill in medicines, a medical charlatan," 1570s; see quack (n.1). The back-formed verb quacksalve (c. 1600) did not thrive.