Webster's English Dictionary

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clam

1. clam \'klam\ n [ME, fr. OE clamm bond, fetter; akin to OHG klamma 
   constriction, L]glomus ball : CLAMP, CLASP 
2. clam n [1clam; fr. the clamping action of the shells] often attrib  1a: 
   any of numerous usu. equivalve edible marine bivalve mollusks living in  
   sand or mud 1b: a freshwater mussel  1c: the flesh of a clam used as food  
   2: a stolid or closemouthed person  3: CLAMSHELL 
3. clam vi or clammed;  or clam.ming : to gather clams esp. by digging