quack (n.)

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

  2. the harsh sound of a duck

    quack (adj.)

  1. medically unqualified; a quack doctor'

    quack (v.)

  1. utter quacking noises; The ducks quacked'

  2. act as a medical quack or a charlatan

The dictionary is based on the WordNet Electronic Lexical Database.
WordNet 3.0 Copyright 2011 by Princeton University. All rights reserved.