American Heritage Dictionary
(6)
Century Dictionary
(13)
GNU Webster's 1913
(7)
WordNet
(5)
Elsewhere on the web
The blinds went away as viksha called with ducks and quack-quack-quack on the flop as he hit deuces full of fives leaving flex212derde with a need for miracle running aces, jacks, or fives.— PokerStars Poker Blog
Most of our modern medicine and surgery was anticipated in the olden time; but it may be said that all of the modes of the quack are as old as humanity.— Old-Time Makers of Medicine The Story of The Students And Teachers of the Sciences Related to Medicine During the Middle Ages
[610] The real word for a quack is hariolus_, and the fact that it is comparatively rare suggests that the character it expresses was not a common one.— The Religious Experience of the Roman People From the Earliest Times to the Age of Augustus
Hence the term quack-salver was commonly used in the seventeenth century, signifying an ignorant person, who was wont to extol the curative virtues of his salves.— Primitive Psycho-Therapy and Quackery

American Heritage Dictionary (2)
Century Dictionary (4)
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