reversal is a topic covered in the Taber's Medical Dictionary.

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(rĭ-vĕr′săl )

[L. reversus, turned back]

1. A change or turning in the opposite direction.
2. In psychology, a change in an instinct or emotion to its opposite, as from love to hate.
3. Provision of an antidote or antagonist to a drug previously ingested or received by a patient.

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