Collision involving current member, one visiting part of W London

• The condition of being pressed closely together and firmly fixed
• A sharp collision produced by striking or dashing against something
• A disorder in which a tooth is so crowded in its socket that it cannot erupt normally

Wikipedia Word definitions in Wikipedia
Impaction is bowel obstruction that can occur in various kinds of animals when they consume something that they cannot digest . For example, in reptiles , common causes of impaction are rocks and sand, which might be accidentally consumed when the reptile ...

WordNet Word definitions in WordNet
n. the condition of being pressed closely together and firmly fixed a disorder in which feces are impacted in the lower colon a disorder in which a tooth is so crowded in its socket that it cannot erupt normally [syn: impacted tooth ] a sharp collision ...

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Impaction \Im*pac"tion\, n. [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.), ...

Wiktionary Word definitions in Wiktionary
n. 1 compression; the packing together of loose matter 2 something packed together tightly; a mass of densely-packed matter 3 (context medicine English) a solid, immobile bulk of stool

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
1739, from Latin impactionem (nominative impactio ) "a striking against," noun of action from past participle stem of impingere (see impinge ).