meaning of impaction
1. 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.
2. 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.
3. a sharp collision produced by striking or dashing against something
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