QUACK (2)

quack (2). Quack, n. a bold but ignorant pretender to phsic

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Quack, n. 1. 1. The cry of the duck, or a sound in imitation of it; a hoarse, quacking noise. Chaucer.
2. 2. [[Cf. Quacksalver.]] A boastful pretender to medical skill; an empiric; an ignorant practitioner.
3. 3. Hence, one who boastfully pretends to skill or knowledge of any kind not possessed; a charlatan.
Quacks political; quacks scientific, academical. Carlyle.