3 entries under this word

Quack

Quăck, v. i.

verbintransitive

v. i. [imp. & p. p. QUACKED (kwăkt); p. pr. & vb. n. QUACKING.] [L. Ger. quacken, N. H. Ger. quaken, D. kwakken, kwaken, Dan. qvække, Icel. qvaka, to twitter, sigh.]

To cry like the common domestic duck.
To make vain and loud pretensions; to boast. “To quack of universal cures.” Hudibras.
To act as a quack.

Quăck, n.

noun

n. [From the verb.] 1. The cry of the domestic duck; a sound such as is made by a duck.

A boastful pretender to medical skill; an empiric; an ignorant practitioner.
Hence, one who boastfully pretends to knowledge not possessed; an ignorant and pretentious practitioner in any branch of knowledge; a charlatan; a mountebank.

Syn.—Empiric; mountebank; charlatan.

Quäck, a.

adjective

a. Pertaining to quackery; used by quacks. If all understood medicine, there would be none to take his quack medicine. Whately.