Impaction
Pronunciation : Im*pac"tion
Part of Speech : n.
Etymology : [L. impactio a striking : cf. F. impaction.]
Definition : 1. (Surg.)
Defn: 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.
Source : Webster's Unabridged Dictionary, 1913