intrusion(redirected from Intrusive igneous rock)
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Etymology: L, intrudere, to push or force in
an orthodontic technique of depressing a tooth back into the occlusal plane or attempting to prevent its eruption or elongation during correction of an excessive overbite. Compare extrusion (def. 3).
n a depression; an inward projection.
an orthodontic procedure in which a tooth is made to move further into the alveolus.