WordReference Random House Unabridged Dictionary of American English © 2017
de•dif•fer•en•ti•a•tion  (dē dif′ə ren′shē āshən),USA pronunciation n. [Biol.]
  1. Developmental Biologya process by which structures or behaviors that were specialized for a specific function lose their specialization and become simplified or generalized.
  • de- + differentiation 1915–20

'dedifferentiation' also found in these entries:
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