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Cryptozoon

[krip-tuh-zoh-on]
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noun
  1. an extinct genus of algae from Precambrian and Cambrian times, forming irregularly hemispherical fossil colonies composed of layers of limy precipitate.
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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. 2018