IPA: /ˌɒsˈtaɪ.ɪtɪs/
KK: /ɑːsˈtaɪtɪs/
A condition where there is swelling and irritation of the bone or bony tissue.
The doctor diagnosed her with osteitis after she complained of severe bone pain.
Osteitis is formed from "osteon" (from Greek "ὀστέον", meaning bone) and "-itis" (from Greek "ἰτίς", meaning inflammation). The word refers to the inflammation of bone tissue.
Think of 'osteon' meaning bone and '-itis' indicating inflammation — osteitis is the inflammation of the bone.