The Collaborative International Dictionary of English v.0.48:

Gladiolus \Gla*di"o*lus\, n.; pl. L. Gladioli, E.
   Gladioluses. [L. See Gladiole.]
   [1913 Webster]
   1. (Bot.) A genus of plants having bulbous roots and gladiate
      leaves, and including many species, some of which are
      cultivated and valued for the beauty of their flowers; the
      corn flag; the sword lily.
      [1913 Webster]

   2. (Anat.) The middle portion of the sternum in some animals;
      the mesosternum.
      [1913 Webster]

WordNet (r) 3.0 (2006):

gladiolus
    n 1: any of numerous plants of the genus Gladiolus native
         chiefly to tropical and South Africa having sword-shaped
         leaves and one-sided spikes of brightly colored funnel-
         shaped flowers; widely cultivated [syn: gladiolus,
         gladiola, glad, sword lily]
    2: the large central part of the breastbone [syn: gladiolus,
       corpus sternum]