Impaction

[im'pækʃәn]

解释:

(noun.) a disorder in which a tooth is so crowded in its socket that it cannot erupt normally.

(noun.) a disorder in which feces are impacted in the lower colon.

(noun.) the condition of being pressed closely together and firmly fixed.

埃尔顿校对--From WordNet

解释:

(n.) 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.

(n.) 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.

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