The Collaborative International Dictionary of English v.0.48:

Raiae \Ra"iae\ (r[=a]"y[=e]), n. pl. [NL. See Raia.] (Zool.)
   The order of elasmobranch fishes which includes the
   sawfishes, skates, and rays; -- called also Rajae, and
   Rajii.
   [1913 Webster]