S in the Immune System Disease MS

This page is the CodyCross answer for the clue below from Performing Arts, Group 886, Puzzle 3 (Violinists).

Question is: S in the Immune System Disease MS

and the answer is: SCLEROSIS

Word Meaning:

SCLEROSIS — (pathology) The abnormal hardening of body tissues, such as an artery; the appearance of hardenings, indurations, lesions, nodules.

Definitions from Wiktionary.