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Greek exostōsis ex- out of exo– osteon bone ost- in Indo-European roots -ōsis -osis
American Heritage Dictionary of the English Language, 5th Edition
From ex- + Ancient Greek ὀστέον (osteon, “bone”).
I am a twelve year old who suffers from multiple hereditary exostosis.
She has very large exostosis on the inside of her knee which caused the problem.
The shoes will show deformation by a substantial bunion or dorsal exostosis.
The warning signs are an increase in size or discomfort of an exostosis after growth has stopped, or unusually rapid growth of one.
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