A person or tool that foliates; someone who beats metal into thin leaves, numbers manuscript pages, or creates foliation.
From 'foliate' plus '-or,' the agent suffix meaning 'one who does' or 'that which does,' creating a noun for the person or device performing the action.
In medieval bookmaking, a foliator was a specialist who did nothing but number pages all day—such a specific job that it deserves its own fancy Latin name!
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