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dietary

[dahy-i-ter-ee]
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adjective
  1. of or relating to diet: a dietary cure.
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noun, plural di·e·tar·ies.
  1. a regulated allowance of food.
  2. Obsolete. a system or course of diet.
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Origin of dietary

1400–50; late Middle English dietarie system of diet. See diet1, -ary
Related formsdi·e·tar·i·ly, adverbpre·di·e·tar·y, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for dietary

dietary

adjective
  1. of or relating to a diet
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noun plural -taries
  1. a regulated diet
  2. a system of dieting
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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 dietary

adj.

1610s, from Medieval Latin dietarius, from Latin diaetarius, from diaeta (see diet (n.1)).

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Online Etymology Dictionary, © 2010 Douglas Harper

dietary in Medicine

dietary

(dīĭ-tĕr′ē)
adj.
  1. Of or relating to diet.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.