With reference to the walls of blood vessels: the process of becoming abnormally stiff or thick; the result of this process; an instance of this…

Abnormal hardening or thickening of the walls of arteries; (frequently with distinguishing word) any of several forms of this, esp. atherosclerosis.

Fatty degeneration of the arterial coats.

A form of arteriosclerosis in which there is lipid accumulation and fibrous plaque formation in the intimal layer of large and medium-sized arteries…