vitamin D

English

Etymology

From vitamin +‎ D (“4th letter”). From being the fourth vitamin discovered. Coined in 1922 by Elmer McCollum, who discovered the vitamin.

Pronunciation

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Noun

vitamin D (uncountable)

  1. (biochemistry) Any of a number of fat-soluble vitamins, required for normal bone development and that prevents rickets; can be manufactured in the skin on exposure to sunlight.
  2. (slang, humorous, somewhat vulgar) A dick (“penis”), especially in a sexual context.
    Synonyms: see Thesaurus:penis

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