noun Biology.
a process by which structures or behaviors that were specialized for a specific function lose their specialization and become simplified or generalized.

1915–20; de- + differentiation Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
dedifferentiation (diːˌdɪfəˌrɛnʃɪˈeɪʃən)
the reversion of the cells of differentiated tissue to a less specialized form

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American Heritage
Medical Dictionary

dedifferentiation de·dif·fer·en·ti·a·tion (dē'dĭf-ə-rěn'shē-ā'shən)
Regression of a specialized cell or tissue to a simpler unspecialized form.

de'dif·fer·en'ti·ate' v.
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