- (n.) The cry of the duck or a sound in imitation of it; a hoarse, quacking noise.
- (v.i.) To act the part of a quack or pretender.
- (v.i.) To make vain and loud pretensions; to boast.
- (n.) Hence, one who boastfully pretends to skill or knowledge of any kind not possessed; a charlatan.
- (v.i.) To utter a sound like the cry of a duck.
- (n.) A boastful pretender to medical skill; an empiric; an ignorant practitioner.
- (a.) Pertaining to or characterized by, boasting and pretension; used by quacks; pretending to cure diseases; as, a quack medicine; a quack doctor.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). quack. Retrieved September 23, 2026, from http://smartdefine.org/quack/definitions/2051502 |
| Chicago | Webster's. 2011. "quack" http://smartdefine.org/quack/definitions/2051502 (accessed September 23, 2026). |
| Harvard | Webster's 2011, quack, Smart Define, viewed 23 September, 2026, <http://smartdefine.org/quack/definitions/2051502>. |
| MLA | Webster's. "quack" 27 May 2011. Web. 23 September 2026. <http://smartdefine.org/quack/definitions/2051502> |