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histiocytoma

(hĭs′tē-ō-sī-tōmə)
n. pl. his•ti•o•cy•to•mas
  1. A tumor composed of histiocytes.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.