expounder

/ɪkˈspaʊndər/
noun
  1. A person who explains or describes something in detail, especially a theory, idea, or text.
    • She is a well-known expounder of modern art, often giving lectures at the museum.
    • The author is a clear expounder of complex scientific ideas for general readers.
    • As an expounder of the constitution, the judge was frequently asked to speak at law schools.
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