Source : Webster's Revised Unabridged Dictionary (1913)

Marabou \Mar`a*bou"\, n.
   A kind of thrown raw silk, nearly white naturally, but
   capable of being dyed without scouring; also, a thin fabric
   made from it, as for scarfs, which resembles the feathers of
   the marabou in delicacy, -- whence the name.

Marabou \Mar`a*bou"\, n. [F.]
   1. (Zo["o]l.) A large stork of the genus {Leptoptilos}
      (formerly {Ciconia}), esp. the African species ({L.
      crumenifer}), which furnishes plumes worn as ornaments.
      The Asiatic species ({L. dubius}, or {L. argala}) is the
      adjutant. See {Adjutant}. [Written also {marabu}.]

   2. One having five eighths negro blood; the offspring of a
      mulatto and a griffe. [Louisiana] --Bartlett.

Source : WordNet®

marabou
     n 1: large African black-and-white carrion-eating stork; downy
          under-wing feathers are used to trim garments [syn: {marabout},
           {marabou stork}, {Leptoptilus crumeniferus}]
     2: downy feathers of marabou storks used for trimming garments