quack

1 of 5

verb (1)

quacked; quacking; quacks

intransitive verb

: to make the characteristic cry of a duck

quack

2 of 5

noun (1)

: a noise made by quacking

quack

3 of 5

verb (2)

quacked; quacking; quacks

intransitive verb

: to act like a quack

quack

4 of 5

noun (2)

1
: charlatan sense 2
Religious quacks on radio and television thinking up new ways to take money from ignorant listeners and incidentally from legitimate churches.Andrew A. Rooney
2
: an ignorant, misinformed, or dishonest practitioner of medicine
No doubt these misunderstandings and dashed hopes have driven many cancer patients and their families into the arms of quacks.Haydn Bush
quackish adjective

quack

5 of 5

adjective

: of, relating to, or used by quacks
quack cancer cures

Examples of quack in a Sentence

Noun (2) don't bother to see that guy, as I've heard he's a quack with no actual training
Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Verb
The birds scurry between the legs of an older goat, quacking nonstop. Sushmita Pathak, The Christian Science Monitor, 25 Sep. 2024 Ducks keep quacking For years, the pipeline from Mater Dei High School in Santa Ana to USC was well known and seemingly uninterrupted. Jon Wilner, The Mercury News, 16 Aug. 2024
Noun
Her favorite recording reminded me of a duck’s quack. Rivka Galchen, The New Yorker, 14 Oct. 2024 Witness the presidential campaign of anti-vaccine crackpot Robert F. Kennedy Jr. and the dangerous attack on medical science by Florida Gov. Ron DeSantis and his quack henchman, Florida Surgeon General Joseph Ladapo. Michael Hiltzik, Los Angeles Times, 30 July 2024
Adjective
And open channels of information have identified and exposed fake news, conspiracy theories, and quack cures, limiting their domination of public discourse on the coronavirus. Dan Reiter, Foreign Affairs, 7 May 2020 This is where quack pseudoscience meets quasi-religious beliefs about how our bodies work, and suspicion of any chemical substance (whether in vaccines, pills, or lotions) is addressed by the pre-modern wisdom of the ages. Miles Klee, Rolling Stone, 4 July 2023 See all Example Sentences for quack 

Word History

Etymology

Verb (1)

alteration of queck to quack, from Middle English queken, from queke, interjection, of imitative origin

Noun (2) and Verb (2)

short for quacksalver

First Known Use

Verb (1)

14th century, in the meaning defined above

Noun (1)

1798, in the meaning defined above

Verb (2)

1628, in the meaning defined above

Noun (2)

1638, in the meaning defined at sense 1

Adjective

1653, in the meaning defined above

Time Traveler
The first known use of quack was in the 14th century

Dictionary Entries Near quack

Cite this Entry

“Quack.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/quack. Accessed 27 Nov. 2024.

Kids Definition

quack

1 of 4 noun
: the cry of a duck
also : a sound resembling this cry

quack

2 of 4 verb
: to make a quack

quack

3 of 4 noun
: a person who makes false claims to special knowledge or ability
especially : one who pretends to have medical skill

quack

4 of 4 adjective
: of, relating to, or used by a person who is a quack
quack medicines
Etymology

Noun

a word created to imitate the sound made by a duck

Noun

a shortened form of earlier quacksalver "a person who pretends to have medical skill"; of Dutch origin

Medical Definition

quack

1 of 2 noun
: a pretender to medical skill : an ignorant or dishonest practitioner
quackish adjective

quack

2 of 2 adjective
: of, relating to, characteristic of, or being a quack
scores of quack remedies for arthritisJane E. Brody

More from Merriam-Webster on quack

Last Updated: - Updated example sentences
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!