sclerosis
Medical term for hardening of tissue or organs; often used in compound disease names like 多発性硬化症 (multiple sclerosis).
Multiple sclerosis is a disease of the central nervous system.
arteriosclerosis; hardening of the arteries
scleroderma; scleroma
systemic sclerosis
multiple sclerosis; MS
primary lateral sclerosis; PLS
amyotrophic lateral sclerosis; ALS; Lou Gehrig's disease
Compound of 硬化 (hardening) + 症 (disease, condition).