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WordReference Random House Unabridged Dictionary of American English © 2024cryp•to•zo•ic (krip′tə zō′ik),USA pronunciation adj. - Geology(cap.) of or pertaining to that part of Precambrian time whose stratigraphic record yields only sparse, primitive fossils.
- Zoologyliving in concealed or secluded places.
n. - Geology(cap.) the part of Precambrian time whose stratigraphic record yields only sparse, primitive fossils.
- crypto- + zo- + -ic 1890–95
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