English word Cryptozoic comes from English crypto- (Cryptographic.. Hidden, invisible.. Secret.), English -zoic
| Dictionary entry | Language | Definition |
|---|---|---|
| crypto- | English (eng) | Cryptographic.. Hidden, invisible.. Secret. |
| -zoic | English (eng) | Relating to some specified form of animal existence. Relating to some specified geologic period. |
| Cryptozoic | English (eng) | (archaic, geology) An eon or other time period before the Cambrian, when the fossils of hard-shelled animals first appeared in the geological record. |