Not differentiated; e.g., primitive, embryonic, immature, or having no special structure or function.
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un·dif·fer·en·ti·at·ed -.dif-ə-'ren-chē-.āt-əd adj not differentiated <an \undifferentiated sarcoma>
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un·dif·fer·en·ti·at·ed (ən-dif″ər-enґshe-āt-əd) anaplastic.Medical dictionary. 2011.