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undifferentiated
From The Collaborative International Dictionary of English v.0.48:
Undifferentiated \Un*dif`fer*en"ti*a`ted\, a. Not differentiated; specifically (Biol.), homogenous, or nearly so; -- said especially of young or embryonic tissues which have not yet undergone differentiation (see Differentiation, 3), that is, which show no visible separation into their different structural parts. [1913 Webster]

