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.

a tooth that has failed to erupt into the oral cavity; in orthodontics this often describes maxillary canines and third permanent molars that occupy a position from which normal eruption is highly unlikely

wedged or packed in together; "an impacted tooth"

A tooth out of alignment from its normal path of eruption. Many impacted teeth never erupt.

tooth: a tooth that is either partially emerged, or submerged under the gum tissue which is blocked from fully emerging by an adjacent tooth.

Describes a tooth not visible above the gum line.