Source : Webster's Revised Unabridged Dictionary (1913)

Cascarilla \Cas`ca*ril"la\, n.[Sp., small thin bark, Peruvian
   bark, dim. of c['a]scara bark.] (Bot.)
   A euphorbiaceous West Indian shrub ({Croton Eleutheria});
   also, its aromatic bark.

   {Cascarilla bark} (or {Cascarilla}) (Med.), the bark of
      {Croton Eleutheria}. It has an aromatic odor and a warm,
      spicy, bitter taste, and when burnt emits a musky odor. It
      is used as a gentle tonic, and sometimes, for the sake of
      its fragrance, mixed with smoking tobacco, when it is said
      to occasion vertigo and intoxication.

Source : WordNet®

cascarilla bark
     n : aromatic bark of cascarilla; used as a tonic and for making
         incense [syn: {eleuthra bark}, {sweetwood bark}]