01 a. Driven together or close.
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1.
Driven together or close.
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2.
Grown in an abnormal direction so that it is wedged against another tooth and cannot erupt normally; -- of teeth, especially the third molar; as, to extract an impacted third molar.(Dentistry)
Phrases & compounds
Impacted fracture —
a fracture in which the fragments are driven into each other so as to be immovable.