A Clam

1. A bivalve mollusk of many kinds, especially those that are edible; for example the soft-shell clam (Mya arenaria), the hard clam (Mercenaria mercenaria), the sea clam or hen clam (*Spisula solidissima*), and other species. The name is said to have been given originally to the Tridacna gigas, a huge East Indian bivalve.
2. Strong pincers or forceps.
3. A kind of vise, usually of wood.
4. (US, slang) A dollar (usually used in the plural).
5. (slang, derogatory) A Scientologist.
6. (slang, vulgar) A vagina.
7. (informal) One who clams up; a taciturn person, one who refuses to speak.
8. A crash or clangor made by ringing all the bells of a chime at once