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hyolithid

[hahy-ol-i-thid]
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noun
  1. 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.
adjective
  1. belonging or pertaining to Hyolithes.

Origin of hyolithid

< New Latin Hyolith(es) (see hyoid, -lith) + -id2
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018