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n. pl. blas·te·mas or blas·te·ma·ta (-mə-tə)
1. A mass of undifferentiated cells from which an organ or a body part develops, either in normal development or in the regeneration of a lost body part.
2. A structureless substance from which it was formerly believed that cells are formed.
[Greek blastēma, offspring, sprout, from blastos, bud.]
blas·te′mal, blas′te·mat′ic (blăs′tə-măt′ĭk), blas·te′mic (blă-stē′mĭk) adj.