A spur-like projection or pointed structure, especially one found on bones or in anatomical structures.
From Latin calcar meaning 'spur,' originally referring to a horseman's spur, later used to describe any spur-shaped anatomical feature.
This word traveled from horse equipment (spurs that knights used to control horses) to anatomy, describing pointed bony projections—it's a perfect example of how medical language borrows from everyday objects.
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