Definitions for undifferentiated
Random House Webster's College Dictionary
describes tissues where the individual cells have not yet developed mature or distinguishing features, or describes embryonic organisms where the organs cannot be identified.
describes a plant body where the vascular tissue has not developed, as in the thallophytes
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
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