dietitian

[dahy-i-tish-uhn]
noun
a person who is an expert in nutrition or dietetics.
Also, dietician.


Origin:
1840–50; diet1 + -itian; see -ician

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Collins
World English Dictionary
dietician or dietitian (ˌdaɪɪˈtɪʃən)
 
n
a person who specializes in dietetics
 
dietitian or dietitian
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

dietitian

dietician
1845, from diet (1) on model of physician.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

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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Example sentences
After getting all of the information, she picked up the telephone and called
  the dietician.
At her income level she can certainly afford a trainer and dietician.
Patients should meet with a dietician or diabetes nutrition expert for help in
  learning this approach.
Consult a registered dietician to help adjust your food plan during pregnancy.
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