mastocytoma

[ măs′tō-sī-tōmə ]

n. pl. mas•to•cy•to•mas

An accumulation or nodule of mast cells that resembles a tumor.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.