A person or thing that distinguishes or differentiates; something that marks or creates a distinction or separation.
From Latin distinctor (one who distinguishes) or from English distinct + -or agent suffix. Rare historical or theoretical term.
Many '-or' agent nouns (doctor, director, senator) are super common, but 'distinctor' barely exists in modern English—we prefer 'thing that distinguishes' instead, showing how word formation habits change!
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