Jump to navigation Jump to search
vitamin + D (“4th letter”). From being the fourth vitamin discovered. Coined in 1922 by Elmer McCollum, who discovered the vitamin.
vitamin D (uncountable)
- (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.
- (humorous, slang) dick (sex with a man)
- vit. D (abbreviation)
any of a number of fat-soluble vitamins