The Collaborative International Dictionary of English v.0.48:

Bearberry \Bear"ber*ry\, n. (Bot.)
   A trailing plant of the heath family (Arctostaphylos
   uva-ursi), having leaves which are tonic and astringent, and
   glossy red berries of which bears are said to be fond.
   [1913 Webster]

WordNet (r) 3.0 (2006):

bearberry
    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 shrub of southeastern and central United States
       [syn: bearberry, possum haw, winterberry, Ilex
       decidua]
    3: chiefly evergreen subshrubs of northern to Arctic areas