One of the mysteries of the English language finally explained.
= osteitis fibrosa.
1920s; earliest use found in Science. From scientific Latin osteodystrophia fibrosa from German Osteodystrophia + post-classical Latin or scientific Latin fibrōsa, feminine singular of fibrōsus fibrous.
osteodystrophia fibrosa/ˌɒstɪəʊdɪsˈtrəʊfɪə fʌɪˈbrəʊsə/
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