IPA: /ˌɑː.sti.oʊ.ɑːrˈθraɪ.tɪs/
KK: /ˌɑːstioʊɑːrˈθraɪtɪs/
A type of joint disease that happens when the cartilage that cushions the joints breaks down, often causing pain and stiffness, especially in older people.
My grandmother suffers from osteoarthritis, which makes it hard for her to walk.
Osteoarthritis → It is formed from "osteo-" (from Greek "osteon", meaning bone) and "arthr-" (from Greek "arthron", meaning joint) and "-itis" (from Greek "itis", meaning inflammation). The word describes inflammation of the joints in the bones.
Think of 'bone' ('osteo-') and 'joint' ('arthr-') being inflamed ('-itis') — that's what osteoarthritis means.