The Collaborative International Dictionary of English v.0.48:

Gymnocladus \Gym*noc"la*dus\ (j[i^]m*n[o^]"l[.a]*d[u^]s), n.
   [NL., fr. Gr. gymno`s naked + kla`dos a branch.] (Bot.)
   A genus of leguminous plants; the Kentucky coffee tree. The
   leaves are cathartic, and the seeds a substitute for coffee.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Gymnocladus
    n 1: small genus of deciduous trees of China and United States
         having paniculate flowers and thick pulpy pods [syn:
         Gymnocladus, genus Gymnocladus]