quack

1
[ kwak ]
/ kwæk /

noun

the harsh, throaty cry of a duck or any similar sound.

verb (used without object)

to utter the cry of a duck or a sound resembling it.

Origin of quack

1
1610–20; imitative; compare Dutch kwakken, German quacken

Definition for quack (2 of 2)

quack2
[ kwak ]
/ kwæk /

noun

a fraudulent or ignorant pretender to medical skill.
a person who pretends, professionally or publicly, to skill, knowledge, or qualifications he or she does not possess; a charlatan.

adjective

verb (used with object)

to treat in the manner of a quack.
to advertise or sell with fraudulent claims.

Origin of quack

2
First recorded in 1620–30; short for quacksalver

OTHER WORDS FROM quack

quack·ish, adjectivequack·ish·ly, adverbquack·ish·ness, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for quack

British Dictionary definitions for quack (1 of 2)

quack1
/ (kwæk) /

verb (intr)

(of a duck) to utter a harsh guttural sound
to make a noise like a duck

noun

the harsh guttural sound made by a duck

Word Origin for quack

C17: of imitative origin; related to Dutch kwakken, German quacken

British Dictionary definitions for quack (2 of 2)

quack2
/ (kwæk) /

noun

  1. an unqualified person who claims medical knowledge or other skills
  2. (as modifier)a quack doctor
British, Australian and NZ informal a doctor; physician or surgeon

verb

(intr) to act in the manner of a quack

Derived forms of quack

quackish, adjective

Word Origin for quack

C17: short for quacksalver
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medicine definitions for quack

quack
[ kwăk ]

n.

An untrained person who pretends to be a physician and dispenses medical advice and treatment.
A charlatan.

Other words from quack

quacker•y n.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.