The Collaborative International Dictionary of English v.0.48:

Hen \Hen\, n. [AS. henn, hen, h[ae]n; akin to D. hen, OHG.
   henna, G. henne, Icel. h?na, Dan. h["o]na; the fem.
   corresponding to AS. hana cock, D. haan, OHG. hano, G. hahn,
   Icel. hani, Dan. & Sw. hane. Prob. akin to L. canere to sing,
   and orig. meaning, a singer. Cf. Chanticleer.] (Zool.)
   The female of the domestic fowl; also, the female of grouse,
   pheasants, or any kind of birds; as, the heath hen; the gray
   hen.
   [1913 Webster]

   Note: Used adjectively or in combination to indicate the
         female; as, hen canary, hen eagle, hen turkey, peahen.
         [1913 Webster]

   Hen clam. (Zool.)
   (a) A clam of the Mactra, and allied genera; the sea clam
       or surf clam. See Surf clam.
   (b) A California clam of the genus Pachydesma.

   Hen driver. See Hen harrier (below).

   Hen harrier (Zool.), a hawk (Circus cyaneus), found in
      Europe and America; -- called also dove hawk, henharm,
      henharrow, hen driver, and usually, in America, marsh
      hawk. See Marsh hawk.

   Hen hawk (Zool.), one of several species of large hawks
      which capture hens; esp., the American red-tailed hawk
      (Buteo borealis), the red-shouldered hawk (Buteo
      lineatus), and the goshawk.
      [1913 Webster]

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.
      [1913 Webster]

WordNet (r) 3.0 (2006):

hen harrier
    n 1: common harrier of North America and Europe; nests in
         marshes and open land [syn: marsh hawk, northern
         harrier, hen harrier, Circus cyaneus]