The Collaborative International Dictionary of English v.0.48:

Osprey \Os"prey\, Ospray \Os"pray\, n. [Through OF. fr. L.
   ossifraga (orig., the bone breaker); prob. influenced by
   oripelargus (mountain stork, a kind of eagle, Gr. ?); cf. OF.
   orpres, and F. orfraie. See Ossifrage.] (Zool.)
   The fishhawk (Pandion haliaetus).
   [1913 Webster]