Trigonia
noun
Tri·go·nia
trīˈgōnēə
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
Word History
Etymology
New Latin, from Latin trigonus triangular (from Greek trigōnos) + New Latin -ia; from the shells suggesting the form of a triangle