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

British Dictionary definitions for dietarily


  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 dietarily



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

Online Etymology Dictionary, © 2010 Douglas Harper

dietarily 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.