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dietitian

or dietician

[dahy-i-tish-uh n] /ˌdaɪ ɪˈtɪʃ ən/
noun
1.
a person who is an expert in nutrition or dietetics.
Origin of dietitian
1840-1850
1840-50; diet1 + -itian; see -ician
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Word Origin and History for dietitian
n.

see dietician.

Online Etymology Dictionary, © 2010 Douglas Harper
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dietitian in Medicine

dietitian di·e·ti·tian or di·e·ti·cian (dī'ĭ-tĭsh'ən)
n.
A person specializing in dietetics.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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