Definition of "expounder" [ex•pound•er]

• A person who expounds, explains (noun)

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• "In the words of Gershom Scholem, the great modern expounder of Jewish messianism, it would have a “catastrophic character.”"
• "Environmental illuminati author and organizer of the 350 Movement Bill McKibben arrived as guest of honor; also present were local top minds Dr. Albert Bartlett of Manhattan Project fame and noted expounder on peak oil and population growth, and Dr. Kevin Trenberth of the National Center of Atmospheric Research, who won the Nobel Peace Prize with his colleagues for their work on two IPCC assessment reports."
• "His obsessive hope of finding a land passage to the Pacific made him the “expounder of a realm never made coherent by map or report,” Mr. Ross writes, a realm stretching from the Appalachians to Oregon (a name Rogers coined for the Pacific Northwest Territory) and “so vast and alien in its contours, fauna, botany, and human occupation that it ­resembled a new planet.”"