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melanocytoma

(mĕl′ə-nō-sī-tōmə)
n.
  1. A benign neoplasm composed of melanocytes.
  2. A usually benign, deeply pigmented melanoma of the optic disk.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.