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Related to Cryptozoic: cryptozoology, Cryptozoic Eon
(Geological Science) of or relating to that part of geological time represented by rocks in which the evidence of life is slight and the life forms are primitive; pre-Phanerozoic
(Geological Science) the Cryptozoic the Cryptozoic era
(Zoology) (of animals) living in dark places, such as holes, caves, and beneath stones