Medical Definition of melanoma
plural mel·a·no·mas also mel·a·no·ma·ta \-mət-ə\play
1: a benign or malignant skin tumor containing dark pigment
2: a tumor of high malignancy that starts in melanocytes of normal skin or moles and metastasizes rapidly and widely—called also malignant melanoma, melanocarcinoma, melanoepithelioma, melanosarcoma
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