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vitamin A

Definitions of vitamin A
  1. noun
    any of several fat-soluble vitamins essential for normal vision; prevents night blindness or inflammation or dryness of the eyes
    synonyms: A, antiophthalmic factor, axerophthol
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    types:
    retinol, vitamin A1
    an unsaturated alcohol that occurs in marine fish-liver oils and is synthesized biologically from carotene
    dehydroretinol, vitamin A2
    a viscous alcohol that is less active in mammals than is vitamin A1
    type of:
    fat-soluble vitamin
    any vitamin that is soluble in fats
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