Definitions
from The Century Dictionary.
- noun The typical genus of the family Trigoniidæ. T. margaritacea is the pearly trigon. See also cut under
Trigoniidæ . - noun A shell of the genus Trigonia or family Trigoniidæ; a trigon: also used attributively: as, the trigonia beds or grits.
from the GNU version of the Collaborative International Dictionary of English.
- noun (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.
Etymologies
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Examples
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Leopold von Buch has discovered exogyra and trigonia in the southern hemisphere (volcano of
COSMOS: A Sketch of the Physical Description of the Universe, Vol. 1 Alexander von Humboldt 1814
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