ar ‧ thri ‧ tis /ɑːˈθraɪtəs, ɑːˈθraɪtɪs $ ɑːr-/ BrE AmE noun [uncountable]
[ Date: 1500-1600 ; Language: Latin ; Origin: Greek , from arthron 'joint' ]
a disease that causes the joints of your body to become swollen and very painful
—arthritic /-ˈθrɪtɪk/ adjective :
arthritic fingers