The Collaborative International Dictionary of English v.0.48:

Fibroma \Fi*bro"ma\ (f[-i]*br[=o]"m[.a]), n. [NL. See Fiber,
   and -oma.] (Med.)
   A tumor consisting mainly of fibrous tissue, or of same
   modification of such tissue.
   [1913 Webster]

WordNet (r) 3.0 (2006):

fibroma
    n 1: nonmalignant tumor of connective tissue