The Collaborative International Dictionary of English v.0.48:

Peregrine \Per"e*grine\ (p[e^]r"[-e]*gr[i^]n; 277), a. [L.
   peregrinus. See Pilgrim.]
   Foreign; not native; extrinsic or from without; exotic.
   [Spelt also pelegrine.] "Peregrine and preternatural heat."
   --Bacon.
   [1913 Webster]

   Peregrine falcon (Zool.), 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.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

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. (Zool.)
      (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.
          [1913 Webster]

                In the language of falconry, the female
                peregrine (Falco peregrinus) is exclusively
                called the falcon.                --Yarrell.
          [1913 Webster]

   2. (Gun.) An ancient form of cannon.
      [1913 Webster]

   Chanting falcon. (Zool.) See under Chanting.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

falcon-gentil \fal"con-gen`til\, falcon-gentle \falcon-gentle\,
   n. [F. faucon-gentil. See Falcon, and Genteel.]
   1. (Zool.) any female falcon; especially
      [PJC]

   2. (Zool.) a female peregrine falcon (Falco peregrinus).

   Syn: falcon-gentil.
        [WordNet 1.5]

   3. (Zool.) The female or young of the goshawk (Accipiter
      gentilis, formerly Astur palumbarius).
      [1913 Webster]

WordNet (r) 3.0 (2006):

Falco peregrinus
    n 1: a widely distributed falcon formerly used in falconry [syn:
         peregrine, peregrine falcon, Falco peregrinus]