Source : Webster's Revised Unabridged Dictionary (1913)

Storax \Sto"rax\, n. [L. storax, styrax, Gr. ?. Cf. {Styrax}.]
   Any one of a number of similar complex resins obtained from
   the bark of several trees and shrubs of the Styrax family.
   The most common of these is {liquid storax}, a brown or gray
   semifluid substance of an agreeable aromatic odor and
   balsamic taste, sometimes used in perfumery, and in medicine
   as an expectorant.

   Note: A yellow aromatic honeylike substance, resembling, and
         often confounded with, storax, is obtained from the
         American sweet gum tree ({Liquidambar styraciflua}),
         and is much used as a chewing gum, called sweet gum,
         and liquid storax. Cf. {Liquidambar}.

Source : WordNet®

storax
     n : a vanilla-scented resin from various trees of the genus
         Styrax