‖Tri‐go″ni‐a (?), n. [NL. See Trigon. So called in allusion to the triangular shape of some species.] (Zoöl.) 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.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.