'Piddock' definitions:

Definition of 'piddock'

(from WordNet)
noun
Marine bivalve that bores into rock or clay or wood by means of saw-like shells

Definition of 'Piddock'

From: GCIDE
  • Piddock \Pid"dock\, n. [Etymol. uncertain.] (Zool.) Any species of Pholas; a pholad. See Pholas. [1913 Webster]