hyolithid

American

[hahy-ol-i-thid] / haɪˈɒl ɪ θɪd /

noun

any invertebrate of the extinct genus Hyolithes, most common in the Cambrian Period, having a limy, univalve shell, and thought to be related to the pteropods.

< New Latin Hyolith ( es ) ( see hyoid, -lith) + -id ²

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Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023