quack 1 (kw k)n. The characteristic sound uttered by a duck. intr.v. quacked, quack·ing, quacks To utter the characteristic sound of a duck. [Middle English quek, of imitative origin.] quack  y adj. |
| quack 2 (kwk) n. 1. An untrained person who pretends to be a physician and dispenses medical advice and treatment. 2. A charlatan; a mountebank. adj. Relating to or characteristic of a quack: a quack cure. intr.v. quacked, quack·ing, quacks To act as a medical quack or a charlatan. [Short for quacksalver.] quack er·y n.quack ish adj.quack ish·ly adv. |
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