Definition of Quack

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

Generic synonyms: Doc, Doctor, Dr., Md, Medico, Physician, Charlatan, Mountebank

2. Verb. Utter quacking noises. "The ducks quacked"
Generic synonyms: Emit, Let Loose, Let Out, Utter

3. Adjective. Medically unqualified. "A quack doctor"
Similar to: Unqualified

4. Noun. The harsh sound of a duck.
Generic synonyms: Sound

5. Verb. Act as a medical quack or a charlatan.
Category relationships: Medicine, Practice Of Medicine
Generic synonyms: Act, Behave, Do
Derivative terms: Quackery

Definition of Quack

1. v. i. To utter a sound like the cry of a duck.

2. n. The cry of the duck, or a sound in imitation of it; a hoarse, quacking noise.

3. a. Pertaining to or characterized by, boasting and pretension; used by quacks; pretending to cure diseases; as, a quack medicine; a quack doctor.

Definition of Quack

1. Noun. The sound made by a duck. ¹

2. Verb. To make a noise like a duck. ¹

3. Noun. A fraudulent healer or incompetent doctor of medicine, an impostor who claims to have qualifications to practice medicine. ¹

4. Noun. A charlatan. ¹

5. Noun. (slang) A doctor. ¹

6. Verb. To practice, commit quackery. ¹

7. Adjective. falsely presented as having medicinal powers. ¹

¹ Source:

Definition of Quack

1. to utter the characteristic cry of a duck [v -ED, -ING, -S]

Medical Definition of Quack

1. Pertaining to or characterised by, boasting and pretension; used by quacks; pretending to cure diseases; as, a quack medicine; a quack doctor. Source: Websters Dictionary (01 Mar 1998)

Lexicographical Neighbors of Quack

quack (current term)
quack like a duck
quack medicine

Literary usage of Quack

Below you will find example usage of this term as found in modern and/or classical literature:

1. Our Young Folks by John Townsend Trowbridge, Lucy Larcom, Gail Hamilton (1871)
"quack, quack, quack 1 Ducks, you have a knack Of talking and saying ... quack, quack, quack! You make a funny track When you waddle through the garden. ..."

2. Recreation by George O. Shields, American Canoe Association, League of American Sportsmen (1902)
"quack! quack! On a joyous autumn morning, Out just before its dawning. When the throb of nature in vour veins, leaves In your • Heart No lack; ..."

3. Teach Me English by Judy Mahoney (1999)
"But the one little duck With the feather on his back, He led the others with his quack, quack, quack, quack, quack, quack, quack, quack, quack. ..."

4. The Judicial Dictionary, of Words and Phrases Judicially Interpreted: To by Frederick Stroud (1903)
"A " quack " is one who pretends to a skill or knowledge which he does not possess; therefore, to call a Practising Medical Man a " quack," or a ..."

5. Pharmaceutical Journal by Pharmaceutical Society of Great Britain (1846)
"SIR,—THE observations in the last number of your journal, upon " Itinerant quack Doctors," appear to call for some remarks. No doubt can be entertained that ..."

6. England and the English in the Eighteenth Century: Chapters in the Social by William Connor Sydney (1891)
"England overrun with quacks in the last century—The evil traced to its source—The methods which quack doctors employed—Specimens of quack advertising—Queen ..."

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