-stenosis
Meaning of -stenosis: The ending that reports a passage has been squeezed tighter, whether by scar, swelling, a growth or thickened valve leaflets.
Definition of -stenosis
-stenosis is a suffix meaning abnormal narrowing of a tube, opening, valve or canal. The word part in front names the structure, so aortic stenosis describes a narrowed heart valve opening and spinal stenosis describes a narrowed spinal canal. It states that the passage is tighter than it should be, not that anything has been blocked completely.
What does the ending mean?
Narrowing. Something that should be an open channel has become tighter than normal, so less can pass through it. The narrowing may sit in a blood vessel, a heart valve, the airway, the gut, a duct carrying bile or urine, or a bony canal enclosing nerves. What matters is the size of the remaining opening, called the lumen, and how much flow that opening still allows.
How does it attach to other words?
Unlike most Greek endings, this one commonly stands as a separate word after an adjective naming the site: aortic stenosis, spinal stenosis, pyloric stenosis. Fused forms such as bronchostenosis exist but are far less used. The grammar differs; the meaning does not, and the site named in front still carries all the anatomy.
| Term | What is narrowed | What follows from it |
|---|---|---|
| Aortic stenosis | The valve opening the left side of the heart pumps through | The heart works against a tighter outlet |
| Spinal stenosis | The bony canal housing the cord and nerve roots | Nerves are crowded, with leg symptoms on walking |
| Pyloric stenosis | The outlet from the stomach into the small bowel | Feeds are returned rather than passing onward |
| Carotid stenosis | The main artery in the neck supplying the brain | Reduced flow, and a surface where clots form |
| Tracheal stenosis | The windpipe below the voice box | Breathing becomes noisy and effortful |
How is it different from a blockage?
Stenosis is a matter of degree, and occlusion is not. An occluded vessel is closed, with nothing passing through it. A stenosed vessel is open but restricted, and may cause no trouble at rest while failing under demand. Atresia is a third word again, describing a passage that never formed an opening at all. Stricture usually implies narrowing caused by scar tissue, which is how bowel narrowing arises after years of inflammation in Crohn disease.
What makes a passage narrow?
Thickening from within, pressure from outside, or scarring after injury. Valve leaflets stiffen and fuse as calcium builds on them. Plaque accumulates inside an artery wall. Bone and ligament thicken around the spinal canal with age. Scar contracts after surgery, radiation or repeated inflammation, and a growing tumor squeezes whatever lies beside it. Narrowing of the aorta itself carries the separate name coarctation, a reminder that the vessel and the valve at its base are different structures.
Also known as
Used in a sentence
The report described moderate stenosis at the origin of the vessel.
Good to know
Stenosis describes a passage that is narrowed rather than closed, so it is not interchangeable with occlusion, and a narrowing that causes nothing at rest can still limit flow once demand rises.
Word origin
Where “-stenosis” comes from
From the Greek stenosis, a narrowing, built on stenos, meaning narrow. The same root gives stenography, writing compressed into narrow marks.