Dictionary![]() ![]() hy•ol•i•thidPronunciation: (hī-ol'i-thid), [key] —n. 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. —adj. belonging or pertaining to Hyolithes. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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