Century Dictionary and Cyclopedia
- n. The typical genus of the family Trigoniidæ. T. margaritacea is the pearly trigon. See also cut under Trigoniidæ.
- n. A shell of the genus Trigonia or family Trigoniidæ; a trigon: also used attributively: as, the trigonia beds or grits.
GNU Webster's 1913
- n. (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.
“Leopold von Buch has discovered exogyra and trigonia in the southern hemisphere (volcano of”
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