The plural form of arthritis, used when referring to multiple cases or types of joint inflammation.
From Greek 'arthritis' + the Greek plural ending '-ides'. Medical terminology maintains Greek plurals instead of using the English '-es', preserving the original classical form.
Many scientific terms keep their Greek plurals (like 'phenomena' from 'phenomenon'), making scientists speak almost like ancient philosophers—'arthritides' sounds fancier than 'arthritises' because Latin and Greek feel more official.
Complete word intelligence in one call. Free tier — 50 lookups/day.