tridacna
noun
tri·dac·na
trə̇ˈdaknə
1
capitalized : a genus of marine bivalves (family Tridacnidae) having no anterior adductor muscle and an equivalve shell the valves of which are very thick and heavy and strongly plicated at the margin see giant clam
2
plural -s : any mollusk of the genus Tridacna : giant clam
Word History
Etymology
New Latin, from Latin, an oyster, from Greek tridaknos eaten at three bites, from tri- three + -daknos (from daknein to bite)