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Webster 1913 Edition

Noun.

[L.

impactio

a striking : cf. F.

impaction

(Surg.)

The driving of one fragment of bone into another so that the fragments are not movable upon each other;

as,

impaction

of the skull or of the hip

An immovable packing;

(Med.)

, a lodgment of something in a strait or passage of the body;

as,

impaction

of the fetal head in the strait of the pelvis;

impaction

of food or feces in the intestines of man or beast.

impaction ‎(plural impactions)