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| Date: | 1500-1600 |
| Origin: | clam 'two-part fastener' (14-20 centuries), from Old English clamm 'chain, rope, etc. for tying something up'; from the tight shutting of a clam shell |
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clam1
[countable]
[countable]1 a shellfish you can eat that has a shell in two parts that open up : 
clam chowder (=a type of soup)
clam chowder (=a type of soup)3 American English informal someone who does not say what they are thinking or feeling
