impaction
noun
1 impaction
The condition of being pressed closely together and firmly fixed.
2 impaction
A disorder in which feces are impacted in the lower colon.
3 impaction
A disorder in which a tooth is so crowded in its socket that it cannot erupt normally.
synonym: impacted tooth.
4 impaction
A sharp collision produced by striking or dashing against something.
synonym: impingement.
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