IPA: //ˌhaɪpəˈrɒstəsɪs//
KK: /haɪˌpɛrəˈstoʊsɪs/
An abnormal increase in the thickness or growth of bone tissue.
The doctor diagnosed the patient with hyperostosis after examining the X-rays.
Hyperostosis is formed from "hyper-" (meaning over or excessive) and "osteon" (from Greek, meaning bone) and the suffix "-osis" (meaning a condition or process). The term describes a condition characterized by excessive growth or thickening of bone.
Think of 'hyper-' meaning excessive and 'osteon' referring to bone — this helps you remember that hyperostosis is a condition of excessive bone growth.