The Collaborative International Dictionary of English v.0.48:

Maia \Ma"i*a\, n. [From L. Maia, a goddess.] (Zool.)
   (a) A genus of spider crabs, including the common European
       species (Maia squinado).
   (b) A beautiful American bombycid moth (Eucronia maia).
       [1913 Webster]