oil of cinnamon

Cassia \Cas"sia\ (k[a^]sh"[.a]), n. [L. cassia and casia, Gr.
   kassi`a and kasi`a; of Semitic origin; cf. Heb.
   qets[imac][=a]h, fr. q[=a]tsa' to cut off, to peel off.]
   1. (Bot.) A genus of leguminous plants (herbs, shrubs, or
      trees) of many species, most of which have purgative
      qualities. The leaves of several species furnish the senna
      used in medicine.
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   2. The bark of several species of {Cinnamomum} grown in
      China, etc.; Chinese cinnamon. It is imported as {cassia},
      but commonly sold as cinnamon, from which it differs more
      or less in strength and flavor, and the amount of outer
      bark attached.
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   Note: The medicinal "cassia" (Cassia pulp) is the laxative
         pulp of the pods of a leguminous tree ({Cassia fistula}
         or Pudding-pipe tree), native in the East Indies but
         naturalized in various tropical countries.
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   {Cassia bark}, the bark of {Cinnamomum cassia}, etc. The
      coarser kinds are called {Cassia lignea}, and are often
      used to adulterate true cinnamon.

   {Cassia buds}, the dried flower buds of several species of
      cinnamon ({Cinnamomum cassia}, atc..).

   {Cassia oil}, oil extracted from cassia bark and cassia buds;
      -- called also {oil of cinnamon}.
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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.
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   {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}.
      [1913 Webster]