melanoblastoma

noun
me·la·no·blas·to·ma | \ mə-ˌlan-ə-blas-ˈtō-mə , ˌmel-ə-nō- \
plural melanoblastomas also melanoblastomata\-mət-ə \

Medical Definition of melanoblastoma 

: a malignant tumor derived from melanoblasts

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occurring twice a year or every two years

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