Found 1 items, similar to trigonia.
English → English (gcide) Definition: Trigonia Trigonia \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. [1913 Webster]