The Collaborative International Dictionary of English v.0.48:

millet \mil"let\ (m[i^]l"l[e^]t), n. [F., dim. of mil, L.
   milium; akin to Gr. meli`nh, AS. mil.] (Bot.)
   The name of several cereal and forage grasses which bear an
   abundance of small roundish grains. The common millets of
   Germany and Southern Europe are Panicum miliaceum, and
   Setaria Italica.

   Note:

   Arabian millet is Sorghum Halepense.

   Egyptian millet or

   East Indian millet is Penicillaria spicata.

   Indian millet is Sorghum vulgare. (See under Indian.)


   Italian millet is Setaria Italica, a coarse, rank-growing
      annual grass, valuable for fodder when cut young, and
      bearing nutritive seeds; -- called also Hungarian grass.


   Texas millet is Panicum Texanum.

   Wild millet, or

   Millet grass, is Milium effusum, a tall grass growing in
      woods.
      [1913 Webster]

WordNet (r) 3.0 (2006):

Italian millet
    n 1: coarse drought-resistant annual grass grown for grain, hay,
         and forage in Europe and Asia and chiefly for forage and
         hay in United States [syn: foxtail millet, Italian
         millet, Hungarian grass, Setaria italica]