: a genus of extinct Silurian and Devonian plicate-shelled or costate-shelled brachiopods having the plates of the brachidium produced into spirally rolled processes with the apices usually directed toward the plane of symmetry of the valve

Word History


New Latin, from a- entry 2 + Greek trypa hole

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Dictionary Entries Near Atrypa

Cite this Entry

“Atrypa.” Dictionary, Merriam-Webster, Accessed 18 Jul. 2024.

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