Sclerosis of the arterial walls WordNet 3.0 & Open English WordNet

Arteriosclerosis is a vascular disorder characterized by abnormal thickening, hardening, and loss of elasticity of the walls of arteries; this process gradually restricts the blood flow to one's organs and tissues and can lead to severe health risks brought on by atherosclerosis, which is a specific form of arteriosclerosis caused by the buildup of fatty plaques, cholesterol, and some other substances in and on the artery walls. Wikipedia

Thickening, hardening and loss of elasticity of the walls of arteries Wikidata

Hardening, narrowing or loss of elasticity in arteries or blood vessels. OmegaWiki

Hardening, narrowing or loss of elasticity in arteries or blood vessel. Wiktionary (translation)