1) Bivalve 2) Lamellibranch 3) Pelecypod 
• (n.) Any species of Pholas; a pholad. See Pholas.
any of the marine bivalve mollusks of the family Pholadidae (Adesmoidea). Worldwide in distribution, they are especially adapted for boring into ... [2 related articles]
Pid'dock noun [ Etymol. uncertain.] (Zoology) Any species of Pholas; a pholad. See Pholas . 
[n] - marine bivalve that bores into rock or clay or wood by means of saw-like shells
noun marine bivalve that bores into rock or clay or wood by means of saw-like shells