Bible Dictionaries
Trigonia
Webster's Dictionary
(n.) 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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Bibliography Information
Webster, Noah. Entry for 'Trigonia'. Noah Webster's American Dictionary. https://www.studylight.org/dictionaries/eng/web/t/trigonia.html. 1828.