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quack1

[kwak] /kwæk/
noun
1.
the harsh, throaty cry of a duck or any similar sound.
verb (used without object)
2.
to utter the cry of a duck or a sound resembling it.
Origin
1610-1620
1610-20; imitative; compare Dutch kwakken, German quacken

quack2

[kwak] /kwæk/
noun
1.
a fraudulent or ignorant pretender to medical skill.
2.
a person who pretends, professionally or publicly, to skill, knowledge, or qualifications he or she does not possess; a charlatan.
adjective
3.
being a quack:
a quack psychologist who complicates everyone's problems.
4.
presented falsely as having curative powers:
quack medicine.
5.
of, pertaining to, or befitting a quack or quackery:
quack methods.
verb (used with object)
6.
to treat in the manner of a quack.
7.
to advertise or sell with fraudulent claims.
Origin
1620-30; short for quacksalver
Related forms
quackish, adjective
quackishly, adverb
quackishness, noun
Synonyms
2. mountebank, phony.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for quack
  • Rabbit hears the phone ring, sheep baa and ducks quack in this volume.
  • What universities of this type are doing is equivalent to quack medicine.
  • Articles suggesting that you can have faster than light communication are quack.
  • Colloidal silver, a quack health supplement, has but one genuine benefit: it may turn your skin a pleasant slate blue.
  • quack medicine seems to work, because people take it when they are sick.
  • Remember that many of the quack theories of his time are now science fact and in use by millions today.
  • Wright read medical reports that the horse serum was a quack remedy.
  • Grown scientists trying to add an emotional boost to an already discredited quack science.
  • We need to give wild ducks the opportunity to emerge and quack their way to success.
  • There were fines for unauthorized borrowing of horses and for peddling quack medicines.
British Dictionary definitions for quack

quack1

/kwæk/
verb (intransitive)
1.
(of a duck) to utter a harsh guttural sound
2.
to make a noise like a duck
noun
3.
the harsh guttural sound made by a duck
Word Origin
C17: of imitative origin; related to Dutch kwakken, German quacken

quack2

/kwæk/
noun
1.
  1. an unqualified person who claims medical knowledge or other skills
  2. (as modifier): a quack doctor
2.
(Brit & Austral, NZ, informal) a doctor; physician or surgeon
verb
3.
(intransitive) to act in the manner of a quack
Derived Forms
quackish, adjective
Word Origin
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
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Word Origin and History for quack
v.

"to make a duck sound," 1610s, earlier quake (1520s), variant of quelke (early 14c.), of echoic origin (cf. Middle Dutch quacken, Old Church Slavonic kvakati, Latin coaxare "to croak," Greek koax "the croaking of frogs," Hittite akuwakuwash "frog"). Middle English on the quakke (14c.) meant "hoarse, croaking." Related: Quacked; quacking.

n.

"medical charlatan," 1630s, short for quacksalver (1570s), from obsolete Dutch quacksalver (modern kwakzalver), literally "hawker of salve," from Middle Dutch quacken "to brag, boast," literally "to croak" (see quack (v.)) + salf "salve," salven "to rub with ointment" (see salve (v.)). As an adjective from 1650s. The oldest attested form of the word in this sense in English is as a verb, "to play the quack" (1620s). The Dutch word also is the source of German Quacksalber, Danish kvaksalver, Swedish kvacksalvare.

duck sound, 1839, from quack (v.).

Online Etymology Dictionary, © 2010 Douglas Harper
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quack in Medicine

quack (kwāk)
n.

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

  2. A charlatan.


quack'er·y n.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Slang definitions & phrases for quack

quack

noun

An incompetent and fraudulent doctor

[1659+; a shortening of quacksalver, ''a person who boasts about the virtues of his worthless remedies''; fr Dutch and found by 1579]


The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D.
Copyright (C) 2007 by HarperCollins Publishers.
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