Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • The symbol for the isotope deuterium.
  • The symbol for the Roman numeral 500.
  • abbreviation dative
  • abbreviation day
  • abbreviation defender
  • abbreviation defense
  • abbreviation defensive
  • abbreviation Democrat
  • abbreviation divorced
  • abbreviation down

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun snooker The semicircle on the baulk line, inside which the cue ball must be placed at a break-off.
  • noun a grade awarded for a class, better than outright failure (which can be F or E depending on the institution) and worse than a C
  • noun chemistry Deuterium, when it needs to be distinguished from ordinary hydrogen.
  • noun computing Hexadecimal symbol for thirteen.
  • noun A standard size of dry cell battery larger than C.
  • noun Vehicle-distinguishing sign for Germany. (clarification of this Translingual definition is being sought)
  • noun biochemistry IUPAC one-letter abbreviation for aspartic acid.
  • noun mathematics The differential operator in calculus and analysis.
  • noun mathematics cardinal number five hundred (500).
  • noun The fourth letter of the English alphabet, called dee and written in the Latin script.
  • noun The ordinal number fourth, derived from this letter of the English alphabet, called dee and written in the Latin script.
  • abbreviation Defense.
  • abbreviation US politics Democrat, especially preceding the constituent location.
  • abbreviation Divorced.
  • abbreviation Down (direction).
  • abbreviation Drive, the setting of an automatic transmission.
  • abbreviation printing Duodecimo, as adopted by the American Library Association.
  • abbreviation Dutch language.
  • abbreviation with “The” The City of Detroit.
  • noun The fourth letter of the basic modern Latin alphabet.

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

From the shape of the upper case letter "D"

from Wiktionary, Creative Commons Attribution/Share-Alike License

From the position (4) of the letter D in the English alphabet.

from Wiktionary, Creative Commons Attribution/Share-Alike License

A simplification of Ð under the graphic influence of the letter D, from a standardization of Ɔ superposed on a ⋌ or ⊢, from the practice of circling each hundredth ⋌ (now Roman numeral V), the tally stick notch mark representing five.

from Wiktionary, Creative Commons Attribution/Share-Alike License

Various abbreviations

from Wiktionary, Creative Commons Attribution/Share-Alike License

From Etruscan 𐌃 (D), from Greek Δ (D, "Delta"), from Phoenician 𐤃 (D, "dalet").

Examples

  • In our latest Congressional Report Card the average Democratic grade was an A - in the House and Senate while Republicans averaged a D in the House and a D+ in the Senate.

    Don Kraus: The House, the Senate, and the World

  • In addition, aging skin produces less vitamin D-- the average 70-year-old person creates only 25 percent of the vitamin D that a 20 year-old does.

    Vitamin D: Why You Are Probably NOT Getting Enough and How That Makes You Sick

  • In addition, aging skin produces less vitamin D-- the average 70-year-old person creates only 25 percent of the vitamin D that a 20 year-old does.

    Mark Hyman, MD: Vitamin D: Why You Are Probably NOT Getting Enough and How That Makes You Sick

  • There has been much excitement lately about the discovery that most modern people suffer a deficit in Vitamin D-- but in reality this Vitamin D deficiency is just part of the larger Vitamin N deficiency.

    Linda Buzzell: Have You Taken Your Vitamin 'N' Today?

  • There has been much excitement lately about the discovery that most modern people suffer a deficit in Vitamin D-- but in reality this Vitamin D deficiency is just part of the larger Vitamin N deficiency.

    Linda Buzzell: Have You Taken Your Vitamin 'N' Today?

  • GUPTA: Well, it's hard to -- there's been a couple of studies talking, for example, about vitamin D and how using vitamin D-- just a normal dose is about 400 international units a day can actually reduce your pancreatic cancer significantly.

    CNN Transcript Mar 6, 2008

  • The problem with that is other studies I've read indicate bodies don't process dietary vitamin D the same way as sunlight vitamin D--and it doesn't have the same health benefits.

    Vitamin D in babies

  • The problem with that is other studies I've read indicate bodies don't process dietary vitamin D the same way as sunlight vitamin D--and it doesn't have the same health benefits.

    Archive 2008-06-01

  • David, why did the administration get a D, almost an F-- a D-- as far as securing nuclear materials and weapons of mass destruction around the world?

    CNN Transcript Dec 5, 2005

  • My transcription is the standard followed by both Szczurowski 1954 and Patkanyi 1963, in which g is understood as a voiced obstruent of unknown/indeterminate value and many perhaps most scholars interpretet it as dental [d] or even interdental fricative [D]!

    languagehat.com: RAT-ENGLISH DICTIONARY.

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    January 2, 2010