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From Medieval Latin diētārius, from Latin diaetārius, from diaeta + -ārius.[1]


  • IPA(key): /ˈdaɪətɹi/, /ˈdaɪəˌtɛɹi/
  • (file)


dietary (not comparable)

  1. Of, or relating to diet.
    If you have any dietary requirements, please inform the kitchen staff.
  2. Comprising a food source.
    • 2016 January 21, “Choose Your Weaponry: Selective Storage of a Single Toxic Compound, Latrunculin A, by Closely Related Nudibranch Molluscs”, in PLOS ONE[1], →DOI:
      For example, the antitumour depsipeptide kahalalide F was isolated from the opisthobranch mollusc Elysia rufescens, and is used by both the mollusc and its dietary alga Bryopsis spp.

Derived terms[edit]



dietary (plural dietaries)

  1. (UK, dated) A regulated diet.
    • 1837 February, Boz [pseudonym; Charles Dickens], “Treats of Oliver Twist’s Growth, Education, and Board”, in Oliver Twist; or, The Parish Boy’s Progress. [], volume I, London: Richard Bentley, [], published 1838, →OCLC, page 30:
      [] Do I understand that he asked for more, after he had eaten the supper allotted by the dietary?” “He did, sir,” replied Bumble. “That boy will be hung,” said the gentleman in the white waistcoat; “I know that boy will be hung.” Nobody controverted the prophetic gentleman’s opinion.


  1. ^ Douglas Harper (2001–2024) “dietary”, in Online Etymology Dictionary.