myxoma

from WordNet (r) 3.0 (2006)

myxoma
    n 1: a benign tumor of connective tissue containing jellylike
         material

from The Collaborative International Dictionary of English v.0.48

Myxoma \Myx*o"ma\, n.; pl. {Myxomata}. [NL., fr. Gr. ? mucus +
   -oma.] (Med.)
   A tumor made up of a gelatinous tissue resembling that found
   in the umbilical cord.
   [1913 Webster]