Definify.com

Webster 1913 Edition

Adj.

Not differentiated; specifically

(Biol.)

, homogenous, or nearly so; – said especially of young or embryonic tissues which have not yet undergone differentiation (see

, 3), that is, which show no visible separation into their different structural parts.

undifferentiated ‎(comparative more undifferentiated, superlative most undifferentiated)

Not differentiated.
(biology) describes tissues where the individual cells have not yet developed mature or distinguishing features, or describes embryonic organisms where the organs cannot be identified.
(botany) describes a plant body where the vascular tissue has not developed, as in the thallophytes