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A specialist in gastroenterology.
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gas·tro·en·ter·ol·o·gist -.en-tə-'räl-ə-jist n a specialist in gastroenterology
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gas·tro·ent·er·ol·o·gist (gas″tro-en″tər-olґə-jist) a specialist in gastroenterology.Medical dictionary. 2011.