One who exscinds or cuts out; a surgical instrument designed for excising tissue.
From Latin 'exscissor,' an agent noun derived from 'exscindere.' The -or suffix creates a noun meaning 'one who does' the action, or by extension, an instrument that performs the action.
This word shows how Latin surgical terminology built tool names directly from verbs—just as 'exscind' means to cut out, 'exscissor' is both the person doing it and potentially the scalpel itself.
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