quack

2
[ 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
SYNONYMS FOR quack
Related formsquack·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 quacker

British Dictionary definitions for quacker (1 of 2)

quack

1
/ (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 quacker (2 of 2)

quack

2
/ (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 Formsquackish, 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 quacker

quack

[ kwăk ]

n.

An untrained person who pretends to be a physician and dispenses medical advice and treatment.
A charlatan.
Related formsquacker•y n.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.