Noun vitamin a has 1 sense
  1. vitamin A, antiophthalmic factor, axerophthol, A - any of several fat-soluble vitamins essential for normal vision; prevents night blindness or inflammation or dryness of the eyes
    --1 is a kind of fat-soluble vitamin
    --1 has particulars: vitamin A1, retinol; vitamin A2, dehydroretinol
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