Tri*go"ni*a\, n. [NL. See Trigon. So called in allusion to the triangular shape of some species.] (Zo["o]l.) A genus of pearly bivalve shells, numerous extinct species of which are characteristic of the Mesozoic rocks. A few living species exist on the coast of Australia.
Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.
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