See more synonyms for dietary on
noun, plural di·e·tar·ies.
  1. a regulated allowance of food.
  2. Obsolete. a system or course of diet.

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 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for dietary


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

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

Online Etymology Dictionary, © 2010 Douglas Harper

dietary in Medicine


  1. Of or relating to diet.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.