Source : Webster's Revised Unabridged Dictionary (1913)

Peregrine \Per"e*grine\, a. [L. peregrinus. See {Pilgrim}.]
   Foreign; not native; extrinsic or from without; exotic.
   [Spelt also {pelegrine}.] ``Peregrine and preternatural
   heat.'' --Bacon.

   {Peregrine falcon} (Zo["o]l.), a courageous and swift falcon
      ({Falco peregrinus}), remarkable for its wide distribution
      over all the continents. The adult plumage is dark bluish
      ash on the back, nearly black on the head and cheeks,
      white beneath, barred with black below the throat. Called
      also {peregrine hawk}, {duck hawk}, {game hawk}, and
      {great-footed hawk}.

Falcon \Fal"con\, n. [OE. faucon, faucoun, OF. faucon, falcon,
   ?. faucon, fr. LL. falco, perh. from L. falx, falcis, a
   sickle or scythe, and named from its curving talons. Cf.
   {Falchion}.]
   1. (Zo["o]l.)
      (a) One of a family ({Falconid[ae]}) of raptorial birds,
          characterized by a short, hooked beak, strong claws,
          and powerful flight.
      (b) Any species of the genus {Falco}, distinguished by
          having a toothlike lobe on the upper mandible;
          especially, one of this genus trained to the pursuit
          of other birds, or game.

                In the language of falconry, the female
                peregrine ({Falco peregrinus}) is exclusively
                called the falcon.                --Yarrell.

   2. (Gun.) An ancient form of cannon.

   {Chanting falcon}. (Zo["o]l.) See under {Chanting}.

Source : WordNet®

Falco peregrinus
     n : a widely distributed falcon formerly used in falconry [syn:
         {peregrine}, {peregrine falcon}]