GNU Collaborative International Dictionary of English

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1.       
   vitamin D n. any of several chemically related fat-soluble vitamins that prevent rickets.  It is found in fish-liver oils, egg yolks and milk.  Component vitamin D2 is also called calciferol, and vitamin D3 is called cholecalciferol.
   
   Syn. -- calciferol, ergocalciferol, cholecalciferol.
   
   [WordNet 1.5]