You know what it looks like… but what is it called?
TAKE THE QUIZtridacna
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
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Merriam-Webster unabridged
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