orthis

Orthis

Or"this\ ([^o]r"th[i^]s), n. [NL., fr. Gr. 'orqo`s straight.] (Zo["o]l.) An extinct genus of Brachiopoda, abundant in the Paleozoic rocks.
Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.
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