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1.                 From The Collaborative International Dictionary of English v.0.48:
                   
   
   
                   
                     
   axerophthol \axerophthol\ n.
      1. a vitamin essential for normal vision (C20H30O); it
         prevents night blindness or inflammation or dryness of the
         eyes; same as vitamin A. One U.S.P. unit of vitamin A is
         equivalent to 0.30 micrograms of pure vitamin A alcohol.
      Syn: vitamin A; vitamin A alcohol; antiophthalmic factor;
           biosterol; retinol; A.
           [WordNet 1.5 +PJC]