Tridacna

[ trih-dak-nuh ]
/ trɪˈdæk nə /

noun

a genus of giant clams inhabiting reefs in the South Pacific, attaining a diameter of 4 feet (1.2 meters) or more, and weighing over 500 pounds (227 kilograms).

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Origin of Tridacna

First recorded in 1770–80; from New Latin, noun use of feminine of Latin tridacnus “requiring three bites,” from Greek trídaknos , equivalent to tri- “three” + dákn(ein) “to bite” + -os adjective suffix; see tri-
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

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