Source : Webster's Revised Unabridged Dictionary (1913)

Orris \Or"ris\, n. [Prob. corrupted from It. ireos iris. See
   {Iris}.] (Bot.)
   A plant of the genus {Iris} ({I. Florentina}); a kind of
   flower-de-luce. Its rootstock has an odor resembling that of
   violets.

   {Orris pea} (Med.), an issue pea made from orris root.

   {Orris root}, the fragrant rootstock of the orris.

Orris \Or"ris\, n.
   1. [Contr. from orfrays, or from arras.] A sort of gold or
      silver lace. --Johnson.

   2. A peculiar pattern in which gold lace or silver lace is
      worked; especially, one in which the edges are ornamented
      with conical figures placed at equal distances, with spots
      between them.

Source : WordNet®

orris
     n 1: German iris having large white flowers with lavender-tinged
          falls and a fragrant rhizome [syn: {Florentine iris}, {Iris
          germanica florentina}, {Iris florentina}]
     2: fragrant rootstock of various irises especially Florentine
        iris; used in perfumes and medicines [syn: {orrisroot}]