Plural of exostosis; multiple benign bony growths or tumors projecting from the surface of bones.
From Greek 'exo-' (outside) + 'osteon' (bone) + '-osis' (condition). The plural form 'exostoses' derives from Greek pluralization patterns and has been standard medical terminology since the 1700s.
Hereditary Multiple Exostoses is a real genetic condition where people grow multiple bony lumps all over their skeleton—it's as if their bones are trying to grow extra skeletons in the wrong places!
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