stenosis

A constriction or narrowing of a duct or passage; a stricture.

The pathological narrowing of a passage.

A narrowing of the opening or hollow of any passage, tube, or orifice. It differs from stricture in being applied especially to diffused rather than localized contractions, and in always indicating an origin organic and not spasmodic.

An abnormal narrowing or stricture in a blood vessel or other tubular organ.

Abnormal narrowing of a bodily canal or passageway.