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English definition of “dietitian”

dietitian

noun [C] (also dietician)     /ˌdaɪ.əˈtɪʃ.ən/
a person who scientifically studies and gives advice about food and eating Diets and dietingMedical studies and the people who study them
(Definition of dietitian noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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