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dietitian

[dahy-i-tish-uh n] /ˌdaɪ ɪˈtɪʃ ən/
noun
1.
a person who is an expert in nutrition or dietetics.
Also, dietician.
Origin
1840-1850
1840-50; diet1 + -itian; see -ician
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for dietitian

dietician

/ˌdaɪɪˈtɪʃən/
noun
1.
a person who specializes in dietetics
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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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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