[1] : The Collaborative International Dictionary of English v.0.48

pholas \pho"las\, n.; pl. pholades. nl., fr. gr. fwla`s,
   fwla`dos, a kind of mollusk. zool.
   any one of numerous species of marine bivalve mollusks of the
   genus pholas, or family pholadidae. they bore holes for
   themselves in clay, peat, and soft rocks.
   1913 webster
see also:
pholades pholas pholadidae 

[2] : WordNet (r) 2.0

pholas
     n : type genus of the family pholadidae: piddocks syn: genus
         pholas
see also:
genus pholas 

Pholas >> P Words
Pholas, definition of term: Pholas
pholas_pag1.html