A ridge of bone or hard tissue projecting outward from a surface.
From Greek exo- 'outside' + rhasis 'a ridging or projection,' possibly related to rhachis 'ridge.' This is a technical anatomical term combining Greek roots.
This word is so specialized that it barely appears in modern anatomy texts, replaced by more common terms like 'exostosis' (bone spur), showing how medical terminology constantly evolves and old terms fade away.
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