Definition of "impaction" [im•pac•tion]

• Compression; the packing together of loose matter (noun)
• Something packed together tightly; a mass of densely-packed matter (noun)
• A solid, immobile bulk of stool (noun)

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• "Enterolith impaction, which is a common cause of colic in California and other regions of the country, is associated with long-term ingestion of large quantities of an alkalinizing feed rich in protein, phosphorous, and magnesium, such as alfalfa, Morton said."
• "_partial_ impaction, that is, an incomplete or partially successful evacuation of the contents of the bowels: the incompleteness is due to disease of the anal and rectal canals."
• "But sometimes it can lead to serious problems, such as impaction or dysreflexia."