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Medical Term:


Pronunciation: re-ver'sal


  1. A turning or changing to the opposite direction, as of a process, disease, symptom, or state.
  2. The changing of a dark line or a bright one of the spectrum into its opposite.
  3. Denoting the difficulty of some people in distinguishing the lowercase printed or written letter p from q or g, b from d, or s from z.
  4. In psychoanalysis, the change of an instinct or affect into its opposite, as from love into hate.

[L. reverto, pp. -versus, to turn back or about]

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