A person who studies, professes or practices genealogy.(noun)
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Use "genealogist" in a sentence
"With scientists debating whether the Donner Party resorted to cannibalism while crossing the Sierra Nevada in 1846, one genealogist is sure of the answer."
"Warren Buffett's sister Doris Buffett, an amateur genealogist, is considering DNA testing to establish a conclusive genetic link."
"Like the Ichabod Crane schoolmaster and the prissy librarian, the genealogist was a specific type, easily recognizable and faintly ridiculous."