The Collaborative International Dictionary of English v.0.48:

Blackwood \Black"wood\ (bl[a^]k"w[oo^]d), n.
   A name given to several dark-colored timbers. The East Indian
   black wood is from the tree Dalbergia latifolia. --Balfour.
   [1913 Webster]

WordNet (r) 3.0 (2006):

blackwood
    n 1: very dark wood of any of several blackwood trees
    2: any of several hardwood trees yielding very dark-colored wood
       [syn: blackwood, blackwood tree]