trɪˈɡoʊniə

Definitions

1. noun

A genus of bivalve molluscs, including species of oysters and rock oysters.

“The trigonia fossils found in the rock layers date back to the Jurassic period.”

2. biology

A type of bivalve mollusc, also known as a trigonid.

“The trigonia is a common type of shellfish found in marine environments.”