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