Of obscure, indeterminate etiology or origin, in contrast to phanerogenic. [crypto- + G. genesis, origin]
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cryp·to·gen·ic .krip-tə-'jen-ik adj of obscure or unknown origin <\cryptogenic epilepsy> compare PHANEROGENIC
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cryp·to·gen·ic (krip″to-jenґik) [crypto- + -genic] idiopathic.Medical dictionary. 2011.