SINCE 1828
tridacna
noun
tri·dac·na
| \ trə̇ˈdaknə\
Definition of tridacna
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
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