Medical Definition of nonmelanoma
: a tumor that is not a melanoma : cancer that does not begin in melanocytes Most skin cancers are nonmelanomas, which rarely spread to other parts of the body.—Jim Ritter, The Chicago Sun-Times, 1 Aug. 2005—often used before another noun The American Cancer Society says that each year more than 1 million new non-melanoma skin-cancer cases are reported …—Stacy Perman, Time, 12 July 2004
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