The Collaborative International Dictionary of English v.0.48:

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.
      [1913 Webster]

   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.
      [1913 Webster]

   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.
         [1913 Webster]

   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.
      [1913 Webster]

WordNet (r) 3.0 (2006):

cassia
    n 1: any of various trees or shrubs of the genus Cassia having
         pinnately compound leaves and usually yellow flowers
         followed by long seedpods
    2: some genus Cassia species often classified as members of the
       genus Senna or genus Chamaecrista [syn: genus Cassia,
       Cassia]
    3: Chinese tree with aromatic bark; yields a less desirable
       cinnamon than Ceylon cinnamon [syn: cassia, cassia-bark
       tree, Cinnamomum cassia]

Easton's 1897 Bible Dictionary:

Cassia
   (1.) Hebrew _kiddah'_, i.e., "split." One of the principal
   spices of the holy anointing oil (Ex. 30:24), and an article of
   commerce (Ezek. 27:19). It is the inner bark of a tree
   resembling the cinnamon (q.v.), the Cinnamomum cassia of
   botanists, and was probably imported from India.

     (2.) Hebrew pl. _ketzi'oth_ (Ps. 45:8). Mentioned in
   connection with myrrh and aloes as being used to scent garments.
   It was probably prepared from the peeled bark, as the Hebrew
   word suggests, of some kind of cinnamon.


U.S. Gazetteer Counties (2000):

Cassia -- U.S. County in Idaho
   Population (2000):    21416
   Housing Units (2000): 7862
   Land area (2000):     2566.445742 sq. miles (6647.063674 sq. km)
   Water area (2000):    13.859946 sq. miles (35.897093 sq. km)
   Total area (2000):    2580.305688 sq. miles (6682.960767 sq. km)
   Located within:       Idaho (ID), FIPS 16
   Location:             42.357856 N, 113.638731 W
   Headwords:
    Cassia
    Cassia, ID
    Cassia County
    Cassia County, ID