The Collaborative International Dictionary of English v.0.48:

Boxwood \Box"wood`\, n.
   The wood of the box (Buxus).
   [1913 Webster]

WordNet (r) 3.0 (2006):

boxwood
    n 1: very hard tough close-grained light yellow wood of the box
         (particularly the common box); used in delicate woodwork:
         musical instruments and inlays and engraving blocks [syn:
         boxwood, Turkish boxwood]
    2: evergreen shrubs or small trees [syn: box, boxwood]