Something that separates or splits things into parts, like a wall or a tool with pointed legs used for measuring.
From 'divide' (from Latin 'dividere') plus the agent suffix '-er,' meaning 'one that divides.' The compound emerged in English around the 16th century as a practical term for both physical objects and mathematical tools.
The same word describes both a compass-like geometry tool AND a wall in your apartment—language often recycles useful concepts across completely different domains, which is why one word can mean so many things.
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