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Meaning of retrusion

re•tru•sion

Pronunciation: (ri-tr'zhun, -shun), [key]
— n. Dentistry.
  1. the act of moving a tooth backward.
  2. a condition characterized by the backward displacement of a tooth or teeth.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.