Dictionary.com
definitions

Cryptozoon

[krip-tuh-zoh-on]

noun

an extinct genus of algae from Precambrian and Cambrian times, forming irregularly hemispherical fossil colonies composed of layers of limy precipitate.

Origin of Cryptozoon

From New Latin, dating back to 1883; see origin at crypto-, -zoon
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019