vitamin a

Noun
  1. Any of several fat-soluble vitamins essential for normal vision;
    Prevents night blindness or inflammation or dryness of the eyes (synset 115114370)
    is a type of: fat-soluble vitamin - any vitamin that is soluble in fats
    subtypes:
    • 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
    same as: a, antiophthalmic factor, axerophthol

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