Source : Webster's Revised Unabridged Dictionary (1913)

Melanoma \Mel`a*no"ma\, n.; L. pl. {-nomata}. [NL.; Gr. ?, ?,
   black + -oma.] (Med.)
   (a) A tumor containing dark pigment.
   (b) Development of dark-pigmented tumors.

Source : WordNet®

melanoma
     n : any of several malignant neoplasms (usually of the skin)
         consisting of melanocytes [syn: {malignant melanoma}]
     [also: {melanomata} (pl)]