WordNet (r) 3.0 (2006):

shittimwood
    n 1: deciduous tree of southeastern United States and Mexico
         [syn: false buckthorn, chittamwood, chittimwood,
         shittimwood, black haw, Bumelia lanuginosa]
    2: shrubby thorny deciduous tree of southeastern United States
       with white flowers and small black drupaceous fruit [syn:
       southern buckthorn, shittimwood, shittim, mock
       orange, Bumelia lycioides]
    3: wood of the shittah tree used to make the ark of the Hebrew
       Tabernacle