The Collaborative International Dictionary of English v.0.48:

Swamp \Swamp\, n. [Cf. AS. swam a fungus, OD. swam a sponge, D.
   zwam a fungus, G. schwamm a sponge, Icel. sv["o]ppr, Dan. &
   Sw. swamp, Goth. swamms, Gr. somfo`s porous, spongy.]
   Wet, spongy land; soft, low ground saturated with water, but
   not usually covered with it; marshy ground away from the
   seashore.
   [1913 Webster]

         Gray swamps and pools, waste places of the hern.
                                                  --Tennyson.
   [1913 Webster]

         A swamp differs from a bog and a marsh in producing
         trees and shrubs, while the latter produce only
         herbage, plants, and mosses.             --Farming
                                                  Encyc. (E.
                                                  Edwards,
                                                  Words).
   [1913 Webster]

   Swamp blackbird. (Zool.) See Redwing
   (b) .

   Swamp cabbage (Bot.), skunk cabbage.

   Swamp deer (Zool.), an Asiatic deer (Rucervus Duvaucelli)
      of India.

   Swamp hen. (Zool.)
   (a) An Australian azure-breasted bird (Porphyrio bellus);
       -- called also goollema.
   (b) An Australian water crake, or rail (Porzana Tabuensis);
       -- called also little swamp hen.
   (c) The European purple gallinule.

   Swamp honeysuckle (Bot.), an American shrub (Azalea
      viscosa syn. Rhododendron viscosa or Rhododendron
      viscosum) growing in swampy places, with fragrant flowers
      of a white color, or white tinged with rose; -- called
      also swamp pink and white swamp honeysuckle.

   Swamp hook, a hook and chain used by lumbermen in handling
      logs. Cf. Cant hook.

   Swamp itch. (Med.) See Prairie itch, under Prairie.

   Swamp laurel (Bot.), a shrub (Kalmia glauca) having small
      leaves with the lower surface glaucous.

   Swamp maple (Bot.), red maple. See Maple.

   Swamp oak (Bot.), a name given to several kinds of oak
      which grow in swampy places, as swamp Spanish oak
      (Quercus palustris), swamp white oak (Quercus
      bicolor), swamp post oak (Quercus lyrata).

   Swamp ore (Min.), bog ore; limonite.

   Swamp partridge (Zool.), any one of several Australian game
      birds of the genera Synoicus and Excalfatoria, allied
      to the European partridges.

   Swamp robin (Zool.), the chewink.

   Swamp sassafras (Bot.), a small North American tree of the
      genus Magnolia (Magnolia glauca) with aromatic leaves
      and fragrant creamy-white blossoms; -- called also sweet
      bay.

   Swamp sparrow (Zool.), a common North American sparrow
      (Melospiza Georgiana, or Melospiza palustris), closely
      resembling the song sparrow. It lives in low, swampy
      places.

   Swamp willow. (Bot.) See Pussy willow, under Pussy.
      [1913 Webster]

WordNet (r) 3.0 (2006):

Rhododendron viscosum
    n 1: shrub growing in swamps throughout the eastern United
         States and having small white to pinkish flowers resembling
         honeysuckle [syn: swamp azalea, swamp honeysuckle,
         white honeysuckle, Rhododendron viscosum]