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dietitian

or di·e·ti·cian

[dahy-i-tish-uh n]
noun
  1. a person who is an expert in nutrition or dietetics.
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Origin of dietitian

1840–50; diet1 + -itian; see -ician
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for dietician

dietician

dietitian

noun
  1. a person who specializes in dietetics
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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

Word Origin and History for dietician

n.

1845, from diet (n.1) on model of physician. Earlier was dietist (c.1600).

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dietitian

n.

see dietician.

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Online Etymology Dictionary, © 2010 Douglas Harper

dietician in Medicine

dietitian

n.
  1. A person specializing in dietetics.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.