mya

from WordNet (r) 3.0 (2006)

Mya
    n 1: type genus of the family Myacidae [syn: {Mya}, {genus Mya}]

from The Collaborative International Dictionary of English v.0.48

Mya \My"a\, prop. n. [L. mya a kind of mussel.] (Zool.)
   A genus of bivalve mollusks, including the common long, or
   soft-shelled, clam.
   [1913 Webster]