myositis

NOUN
8 LETTERS · STARTS WITH M

myositis is a valid 8-letter word worth 13 points in Scrabble and 13 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
M3Y4O1S1I1T1I1S1
3 + 4 + 1 + 1 + 1 + 1 + 1 + 1 =13 PTS
DOUBLE WORD → 26TRIPLE WORD → 39
MEANING

What does myositis mean?