The Collaborative International Dictionary of English v.0.48:

manzanita \man`za*ni"ta\ (m[a^]n`z[.a]*n[=e]"t[.a]), n. [Sp.,
   dim. of manzana an apple.] (Bot.)
   A name given to several species of Arctostaphylos, but
   mostly to Arctostaphylos glauca and Arctostaphylos
   pungens, shrubs of California, Oregon, etc., with reddish
   smooth bark, ovate or oval coriaceous evergreen leaves, and
   bearing clusters of red berries, which are said to be a
   favorite food of the grizzly bear.
   [1913 Webster]

WordNet (r) 3.0 (2006):

manzanita
    n 1: chiefly evergreen shrubs of warm dry areas of western North
         America
    2: evergreen tree of the Pacific coast of North America having
       glossy leathery leaves and orange-red edible berries; wood
       used for furniture and bark for tanning [syn: madrona,
       madrono, manzanita, Arbutus menziesii]