The Collaborative International Dictionary of English v.0.48:

Harpy \Har"py\ (h[aum]r"p[y^]), n.; pl. Harpies (-p[i^]z). [F.
   harpie, L. harpyia, Gr. "a`rpyia, from the root of "arpa`zein
   to snatch, to seize. Cf. Rapacious.]
   1. (Gr. Myth.) A fabulous winged monster, ravenous and
      filthy, having the face of a woman and the body of a
      vulture, with long claws, and the face pale with hunger.
      Some writers mention two, others three.
      [1913 Webster]

            Both table and provisions vanished quite.
            With sound of harpies' wings and talons heard.
                                                  --Milton.
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   2. One who is rapacious or ravenous; an extortioner.
      [1913 Webster]

            The harpies about all pocket the pool. --Goldsmith.
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   3. (Zool.)
      (a) The European moor buzzard or marsh harrier (Circus
          [ae]ruginosus).
      (b) A large and powerful, double-crested, short-winged
          American eagle (Thrasa["e]tus harpyia). It ranges
          from Texas to Brazil.
          [1913 Webster]

   Harpy bat (Zool.)
      (a) An East Indian fruit bat of the genus Harpyia (esp.
          Harpyia cephalotes), having prominent, tubular
          nostrils.
      (b) A small, insectivorous Indian bat (Harpiocephalus
          harpia).

   Harpy fly (Zool.), the house fly.
      [1913 Webster] Harquebus

The Collaborative International Dictionary of English v.0.48:

Harrier \Har"ri*er\, n. [From Harry.]
   1. One who harries.
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   2. (Zool.) One of several species of hawks or buzzards of the
      genus Circus which fly low and harry small animals or
      birds, -- as the European marsh harrier (Circus
      [ae]ruginosus), and the hen harrier (Circus cyaneus).
      [1913 Webster]

   Harrier hawk (Zool.), one of several species of American
      hawks of the genus Micrastur.
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The Collaborative International Dictionary of English v.0.48:

Marsh \Marsh\, n. [OE. mersch, AS. mersc, fr. mere lake. See
   Mere pool, and cf. Marish, Morass.]
   A tract of soft wet land, commonly covered partially or
   wholly with water; a fen; a swamp; a morass. [Written also
   marish.]
   [1913 Webster]

   Marsh asphodel (Bot.), a plant (Nartheeium ossifragum)
      with linear equitant leaves, and a raceme of small white
      flowers; -- called also bog asphodel.

   Marsh cinquefoil (Bot.), a plant (Potentilla palustris)
      having purple flowers, and found growing in marshy places;
      marsh five-finger.

   Marsh elder. (Bot.)
   (a) The guelder-rose or cranberry tree (Viburnum Opulus).
   (b) In the United States, a composite shrub growing in salt
       marshes (Iva frutescens).

   Marsh five-finger. (Bot.) See Marsh cinquefoil (above).


   Marsh gas. (Chem.) See under Gas.

   Marsh grass (Bot.), a genus (Spartina) of coarse grasses
      growing in marshes; -- called also cord grass. The tall
      Spartina cynosuroides is not good for hay unless cut
      very young. The low Spartina juncea is a common
      component of salt hay.

   Marsh harrier (Zool.), a European hawk or harrier (Circus
      aeruginosus); -- called also marsh hawk, moor hawk,
      moor buzzard, puttock.

   Marsh hawk. (Zool.)
   (a) A hawk or harrier (Circus cyaneus), native of both
       America and Europe. The adults are bluish slate above,
       with a white rump. Called also hen harrier, and mouse
       hawk.
   (b) The marsh harrier.

   Marsh hen (Zool.), a rail; esp., Rallus elegans of
      fresh-water marshes, and Rallus longirostris of
      salt-water marshes.

   Marsh mallow (Bot.), a plant of the genus Althaea (
      Althaea officinalis) common in marshes near the
      seashore, and whose root is much used in medicine as a
      demulcent.

   Marsh marigold. (Bot.) See in the Vocabulary.

   Marsh pennywort (Bot.), any plant of the umbelliferous
      genus Hydrocotyle; low herbs with roundish leaves,
      growing in wet places; -- called also water pennywort.


   Marsh quail (Zool.), the meadow lark.

   Marsh rosemary (Bot.), a plant of the genus Statice
      (Statice Limonium), common in salt marshes. Its root is
      powerfully astringent, and is sometimes used in medicine.
      Called also sea lavender.

   Marsh samphire (Bot.), a plant (Salicornia herbacea)
      found along seacoasts. See Glasswort.

   Marsh St. John's-wort (Bot.), an American herb (Elodes
      Virginica) with small opposite leaves and flesh-colored
      flowers.

   Marsh tea. (Bot.). Same as Labrador tea.

   Marsh trefoil. (Bot.) Same as Buckbean.

   Marsh wren (Zool.), any species of small American wrens of
      the genus Cistothorus, and allied genera. They chiefly
      inhabit salt marshes.
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The Collaborative International Dictionary of English v.0.48:

Buzzard \Buz"zard\ (b[u^]z"z[~e]rd), n.[O.E. busard, bosard, F.
   busard, fr. buse, L. buteo, a kind of falcon or hawk.]
   [1913 Webster]
   1. (Zool.) A bird of prey of the Hawk family, belonging to
      the genus Buteo and related genera.
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   2. (Zool.) In the United States, a term used for the turkey
      vulture (Cathartes aura), and sometimes
      indiscriminately to any vulture.
      [PJC]

   Note: The Buteo vulgaris is the common buzzard of Europe.
         The American species (of which the most common are
         Buteo borealis, Buteo Pennsylvanicus, and Buteo
         lineatus) are usually called hen hawks. -- The
         rough-legged buzzard, or bee hawk, of Europe (Pernis
         apivorus) feeds on bees and their larv[ae], with other
         insects, and reptiles. -- The moor buzzard of Europe is
         Circus [ae]ruginosus. See Turkey buzzard, and
         Carrion buzzard.
         [1913 Webster]

   Bald buzzard, the fishhawk or osprey. See Fishhawk.
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   2. A blockhead; a dunce.
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            It is common, to a proverb, to call one who can not
            be taught, or who continues obstinately ignorant, a
            buzzard.                              --Goldsmith.
      [1913 Webster]

WordNet (r) 3.0 (2006):

Circus Aeruginosus
    n 1: Old World harrier frequenting marshy regions [syn: marsh
         harrier, Circus Aeruginosus]