noun Ex·o·gy·ra \ˌeksəˈjīrə\

Definition of Exogyra

  1. :  a genus of Upper Jurassic and Cretaceous bivalve mollusks that have thick shells and spirally twisted beak and are related to the true oysters

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Origin and Etymology of exogyra

New Latin, from exo- + -gyra (from Greek gyros ring, circle, from gyros round) — more at cower

Seen and Heard

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a rounded knoll or a ridge of ice

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