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]

The Collaborative International Dictionary of English v.0.48:

Fishhawk \Fish"hawk`\, n. (Zool.)
   The osprey (Pandion halia["e]tus), found both in Europe and
   America; -- so called because it plunges into the water and
   seizes fishes in its talons. Called also fishing eagle, and
   bald buzzard.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Pandion haliaetus
    n 1: large harmless hawk found worldwide that feeds on fish and
         builds a bulky nest often occupied for years [syn:
         osprey, fish hawk, fish eagle, sea eagle, Pandion
         haliaetus]