Trigonia

noun
Tri·​go·​nia | \ trīˈgōnēə\

Definition of Trigonia

1 : a genus of pearly-shelled bivalve mollusks (suborder Arcacea) including many extinct forms which characterize the Mesozoic rocks and a few living forms which survive on the coast of Australia
2 [ New Latin; from the often triangular shape of the fruit ] : a genus (the type of the family Trigoniaceae) of chiefly climbing tropical American shrubs

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History and Etymology for Trigonia

New Latin, from Latin trigonus triangular (from Greek trigōnos) + New Latin -ia; from the shells suggesting the form of a triangle

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