The Collaborative International Dictionary of English v.0.48:

Neuroma \Neu*ro"ma\, n. [NL. See Neuro-, and -oma.] (Med.)
   A tumor developed on, or connected with, a nerve, esp. one
   consisting of new-formed nerve fibers.
   [1913 Webster]

WordNet (r) 3.0 (2006):

neuroma
    n 1: any tumor derived from cells of the nervous system