Relating to the study or collection of antiquities; can also refer to a person devoted to the study of ancient things and historical artifacts.
From antiquity plus -arian (one who supports or is devoted to). Rare variant of antiquarian, emphasizing the ANTIQUITIES themselves rather than just the people studying them.
This variant is rarer than 'antiquarian,' which suggests it might be a back-formation—someone working backward from 'antiquarian' to create a more direct link to 'antiquity' itself. Language evolution isn't always forward!
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