di·e·tar·y

[dahy-i-ter-ee] adjective, noun, plural di·e·tar·ies.
adjective
1.
of or pertaining to diet: a dietary cure.
noun
2.
a regulated allowance of food.
3.
Obsolete. a system or course of diet.

Origin:
1400–50; late Middle English dietarie system of diet. See diet1, -ary

di·e·tar·i·ly, adverb
pre·di·e·tar·y, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
dietary (ˈdaɪətərɪ, -trɪ) [Click for IPA pronunciation guide]
 
adj
1.  of or relating to a diet
 
n , -taries
2.  a regulated diet
3.  a system of dieting

Collins English Dictionary - Complete & Unabridged 10th Edition
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Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Dietary is always a great word to know.
So is zedonk. Does it mean:
a fool or simpleton; ninny.
the offspring of a zebra and a donkey.
Etymonline
Word Origin & History

dietary
1610s, from L. diaetarius, from diaeta (see diet (1)).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

dietary di·e·tar·y (dī'ĭ-těr'ē)
adj.
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.
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Example sentences
Other evidence also supports a link to a lack of dietary fiber.
Dietary fats do not raise blood sugar levels or fat metabolism in the absence
  of enabling concomitant dietary carbohydrates.
But what is no longer advisable is their regular use as dietary supplements.
Dietary calcium binds the oxalate in your intestine.
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