The Collaborative International Dictionary of English v.0.48:

Melanorrhoea \Mel`a*nor*rhoe"a\, n. [NL., fr. Gr. me`las,
   me`lanos, black + ? to flow.] (Bot.)
   An East Indian genus of large trees. Melanorrh[oe]a
   usitatissima is the lignum-vitae of Pegu (in Burma), and
   yields a valuable black varnish.
   [1913 Webster]