vitamin definition, vitamin meaning | English dictionary

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vitamin

  

      n   any of a group of substances that are essential, in small quantities, for the normal functioning of metabolism in the body. They cannot usually be synthesized in the body but they occur naturally in certain foods: insufficient supply of any particular vitamin results in a deficiency disease  
     (C20 vit- from Latin vita life + -amin from amine; so named by Casimir Funk, who believed the substances to be amines)  
  vitaminic      adj  


vitamin A  
      n   a fat-soluble yellow unsaturated alcohol occurring in green and yellow vegetables (esp. carrots), butter, egg yolk, and fish-liver oil (esp. halibut oil). It is essential for the prevention of night blindness and the protection of epithelial tissue. Formula: C20H30O,   (Also called)    vitamin A1, retinol  
vitamin A2  
      n   a vitamin that occurs in the tissues of freshwater fish and has a function similar to that of vitamin A. Formula: C20H28O,   (Also called)    dehydroretinol  
vitamin B  
      n   pl   , B vitamins   any of the vitamins in the vitamin B complex  
vitamin B1  
      n      another name for       thiamine  
vitamin B2  
      n      another name for       riboflavin  
vitamin B6  
      n      another name for       pyridoxine  
vitamin B12  
      n      another name for       cyanocobalamin  
vitamin B complex  
      n   a large group of water-soluble vitamins occurring esp. in liver and yeast: includes thiamine, riboflavin, nicotinic acid, pyridoxine, pantothenic acid, biotin, choline, folic acid, and cyanocobalamin,   (Sometimes shortened to)    B complex  
vitamin C  
      n      another name for       ascorbic acid  
vitamin D  
      n   pl   , D vitamins   any of the fat-soluble vitamins, including calciferol and cholecalciferol, occurring in fish-liver oils (esp. cod-liver oil), milk, butter, and eggs: used in the treatment of rickets and osteomalacia  
vitamin D1  
      n   the first isolated form of vitamin D, consisting of calciferol and its precursor, lumisterol  
vitamin D2  
      n      another name for       calciferol  
vitamin D3  
      n      another name for       cholecalciferol  
vitamin E  
      n      another name for       tocopherol  
vitamin G  
      n      another name (esp. U.S. and Canadian) for       riboflavin  
vitamin H  
      n      another name (esp. U.S. and Canadian) for       biotin  
vitamin K  
      n   pl   , K vitamins   any of the fat-soluble vitamins, including phylloquinone and the menaquinones, which are essential for the normal clotting of blood  
vitamin K1  
      n      another name for       phylloquinone  
vitamin K2  
      n      another name for       menaquinone  
vitamin K3  
      n      a former name for       menadione  
vitamin P  
      n   pl   , P vitamins   any of a group of water-soluble crystalline substances occurring mainly in citrus fruits, blackcurrants, and rosehips: they regulate the permeability of the blood capillaries,   (Also called)    citrin, bioflavonoid  
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"Collins English Dictionary 5th Edition first published in 2000 © HarperCollins Publishers 1979, 1986, 1991, 1994, 1998, 2000 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"