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crys'tal detec'tor



Radio.
a device for rectifying a modulated radio-frequency signal, consisting of a crystal of germanium, silicon, galena, or the like with a cat whisker contact, permitting a high-frequency current to pass freely in one direction only: one of the two principal components of a crystal set.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

crystal defectcrystal gazing
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