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Tridacna

 - 1 dictionary result

Tri⋅dac⋅na

  [tri-dak-nuh]
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–noun
a genus of giant clams inhabiting reefs in the South Pacific, attaining a diameter of 4 ft. (1.2 m) or more, and weighing over 500 lb. (227 kg).
Origin:
1770–80; < NL, n. use of fem. of L tridacnus requiring three bites < Gk trídaknos, equiv. to tri- tri- + dákn(ein) to bite + -os adj. suffix
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Based on the Random House Dictionary, © Random House, Inc. 2009.
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