The Collaborative International Dictionary of English v.0.48:

chittamwood \chittamwood\ n.
   1. a shrubby tree of the U. S. Pacific coast (Rhamnus
      purshianus or Rhamnus purshiana), whose bark is the
      cascara sagrada, used as a mild cathartic or laxative.

   Syn: cascara, cascara buckthorn, bearberry, bearwood,
        chittimwood, Rhamnus purshianus.
        [WordNet 1.5]

   2. a deciduous tree of SE U.S. and Mexico.

   Syn: false buckthorn, chittimwood, shittimwood, black haw,
        Bumelia lanuginosa.
        [WordNet 1.5]

   3. a shrubby tree of southern U.S. (Cotinus obovatus)
      having large plumes of feathery flowers resembling puffs
      of smoke; -- called also American smoke tree.

   Syn: American smokewood, Cotinus americanus, Cotinus
        obovatus.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

chittamwood
    n 1: shrubby tree of the Pacific coast of the United States;
         yields cascara sagrada [syn: cascara buckthorn,
         bearberry, bearwood, chittamwood, chittimwood,
         Rhamnus purshianus]
    2: deciduous tree of southeastern United States and Mexico [syn:
       false buckthorn, chittamwood, chittimwood,
       shittimwood, black haw, Bumelia lanuginosa]
    3: shrubby tree of southern United States having large plumes of
       feathery flowers resembling puffs of smoke [syn: American
       smokewood, chittamwood, Cotinus americanus, Cotinus
       obovatus]