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Free English Dictionary

[v. i.] - To utter a sound like the cry of a duck.
[v. i.] - To make vain and loud pretensions; to boast.
[v. i.] - To act the part of a quack, or pretender.
[n.] - The cry of the duck, or a sound in imitation of it; a hoarse, quacking noise.
[n.] - A boastful pretender to medical skill; an empiric; an ignorant practitioner.
[n.] - Hence, one who boastfully pretends to skill or knowledge of any kind not possessed; a charlatan.
[a.] - Pertaining to or characterized by, boasting and pretension; used by quacks; pretending to cure diseases; as, a quack medicine; a quack doctor.