Main Entry:  Zyklon
Part of Speech:  n
Definition:  hydrogen cyanide used as a poisonous gas, esp. in Nazi concentration camps
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Word Origin & History

1926, from Ger. Zyklon, commercial name of a type of hydrogen cyanide, of unknown etymology, but it is the usual German form of the word cyclone. Originally used as a pesticide and fumigant.
Online Etymology Dictionary, © 2010 Douglas Harper
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