Why is the ninth month called September?
"inflammation of a joint," 1540s, from medical Latin arthritis, from Greek (nosos) arthritis "(disease) of the joints," from arthritis, fem. of arthrites (adj.) "pertaining to joints" (Greek nosos is a fem. noun), from arthron "a joint" (see arm (n.1)).
arthritis ar·thri·tis (är-thrī'tĭs)
n. pl. ar·thrit·i·des (-thrĭt'ĭ-dēz')
Inflammation of a joint or joints resulting in pain and swelling. Also called articular rheumatism.
Acute or chronic inflammation of one or more joints, usually accompanied by pain and stiffness, resulting from infection, trauma, degenerative changes, autoimmune disease, or other causes. See also osteoarthritis, rheumatoid arthritis.
The inflammation of tissues in the joints (such as osteoarthritis and rheumatoid arthritis), usually resulting in pain and stiffness.