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.
noun A type of strong pincers or forceps.
noun A kind of vise, usually of wood.
noun A dollar.
Those sneakers cost me fifty clams!
noun A Scientologist.
noun A vagina or vulva.
noun A wrong or misplaced note.
noun One who clams up; a taciturn person, one who refuses to speak.