A person who is skilled in or practices using two languages, or someone who creates diglottic works.
From 'diglott' (a two-language text) plus the agent suffix '-ist'. The term developed in the 16th-17th centuries among scholars and printers working with bilingual texts.
Renaissance scholars like Desiderius Erasmus were diglottists who created stunning parallel-text editions of classical and religious works that shaped how we read texts today.
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