Definition of retrusion in US English:

retrusion

noun

Dentistry
  • The action of putting or moving something back; (Dentistry) backward movement or position of the jaw, especially the mandible, or teeth.

Origin

Mid 17th century; earliest use found in William Harvey (1578–1657), physician and discoverer of the circulation of the blood. From post-classical Latin retrusion-, retrusio confinement, action of thrusting back from classical Latin retrūs-, past participial stem of retrūdere + -iō.

Pronunciation

retrusion

/rɪˈtruːʒn/