The Collaborative International Dictionary of English v.0.48:

gopherwood \gopherwood\ n.
   A small handsome round-headed deciduous tree (Cladrastis
   lutea) having showy white flowers in terminal clusters and
   heavy hardwood yielding yellow dye; also called yellowwood.

   Syn: Kentucky yellowwood, Cladrastis lutea, Cladrastis
        kentukea, yellowwood.
        [WordNet 1.5]

The Collaborative International Dictionary of English v.0.48:

Yellowwood \Yel"low*wood`\, n. (Bot.)
   The wood of any one of several different kinds of trees;
   also, any one of the trees themselves. Among the trees so
   called are the Cladrastis tinctoria, an American leguminous
   tree; the several species of prickly ash (Xanthoxylum); the
   Australian Flindersia Oxleyana, a tree related to the
   mahogany; certain South African species of Podocarpus,
   trees related to the yew; the East Indian Podocarpus
   latifolia; and the true satinwood (Chloroxylon Swietenia).
   All these Old World trees furnish valuable timber.
   [1913 Webster]
   [1913 Webster]

WordNet (r) 3.0 (2006):

yellowwood
    n 1: the yellow wood of any of various yellowwood trees
    2: any of various trees having yellowish wood or yielding a
       yellow extract [syn: yellowwood, yellowwood tree]