Source : Webster's Revised Unabridged Dictionary (1913)

Cinnamon \Cin"na*mon\, n. [Heb. qinn[=a]m[=o]n; cf. Gr. ?, ?,
   cinnamomum, cinnamon. The Heb. word itself seems to have been
   borrowed from some other language; cf. Malay k[=a]j[=u]
   m[=a]nis sweet wood.]
   (a) The inner bark of the shoots of {Cinnamomum Zeylanicum},
       a tree growing in Ceylon. It is aromatic, of a moderately
       pungent taste, and is one of the best cordial,
       carminative, and restorative spices.
   (b) Cassia.

   {Cinnamon stone} (Min.), a variety of garnet, of a cinnamon
      or hyacinth red color, sometimes used in jewelry.

   {Oil of cinnamon}, a colorless aromatic oil obtained from
      cinnamon and cassia, and consisting essentially of
      cinnamic aldehyde, {C6H5.C2H2.CHO}.

   {Wild cinnamon}. See {Canella}.

Source : WordNet®

cinnamon
     n 1: aromatic bark used as a spice [syn: {cinnamon bark}]
     2: tropical Asian tree with aromatic yellowish-brown bark;
        source of the spice cinnamon [syn: {Ceylon cinnamon}, {Ceylon
        cinnamon tree}, {Cinnamomum zeylanicum}]
     3: spice from the dried aromatic bark of the Ceylon cinnamon
        tree; used as rolled strips or ground