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giant clam

American  
[jahy-uhnt klam] / ˈdʒaɪ ənt ˈklæm /

noun

  1. any of several huge clams of the family Tridacnidae, inhabiting the shallow waters of coral reefs in the tropical Indo-Pacific, including Tridacna squamosa fluted giant clam, a relatively hardy but conservation dependent species that grows to about 16 inches (40 centimeters) across.

Etymology

Origin of giant clam

First recorded in 1945–50

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.