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Clam

/klˈæm/
B1
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(noun) A bivalve mollusk of many kinds, especially those that are edible; for example soft-shell clams (Mya arenaria), hard clams (Mercenaria mercenaria), sea clams or hen clams (Spisula solidissima), and other species, possibly originally applied to clams of species Tridacna gigas, a huge East Indian bivalve.

I am as happy as a clam.
Tom is happy as a clam.
CEFR Practice Quiz
We found a large ____ while we were walking along the beach today.

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