Longman Dictionary of Contemporary English homepage

Topic: NURSES, DOCTORS, ETC

Sense: 1
Date: 1800-1900
Origin: QUACK1
Sense: 2-3
Date: 1600-1700
Origin: quacksalver 'quack' (16-19 centuries), from early Dutch, probably from quacken 'to quack, talk' + salf 'cure'

quack

2 noun
     
quack2 [countable]
1C the sound a duck makes
2 someone who pretends to be a doctor - used in order to show disapproval:
quacks selling weight-loss drugs
3 British English informalMN a doctor:
You'd better go and see the quack with that burn.
Definition of quack from the Longman Dictionary of Contemporary English within
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