The Collaborative International Dictionary of English v.0.48:

Papilloma \Pap`il*lo"ma\, n.; pl. Papillomata. [NL. See
   Papilla, and -Oma.] (Med.)
   A tumor formed by hypertrophy of the papill[ae] of the skin
   or mucous membrane, as a corn or a wart. --Quain.
   [1913 Webster]

WordNet (r) 3.0 (2006):

papilloma
    n 1: a benign epithelial tumor forming a rounded mass [syn:
         papilloma, villoma, papillary tumor, papillary
         tumour]

Moby Thesaurus II by Grady Ward, 1.0:

61 Moby Thesaurus words for "papilloma":
   bilge, blain, bleb, blister, blob, boss, bow, bubble, bulb, bulge,
   bulla, bump, bunch, burl, button, cahot, chine, clump, condyle,
   convex, dowel, ear, flange, flap, gall, gnarl, handle, hill, hump,
   hunch, jog, joggle, knob, knot, knur, knurl, lip, loop, lump, mole,
   mountain, nevus, nub, nubbin, nubble, peg, rib, ridge, ring,
   shoulder, spine, stud, style, tab, tubercle, tubercule, verruca,
   vesicle, wale, wart, welt