axerophthol

English Thesaurus

1. any of several fat-soluble vitamins essential for normal vision; prevents night blindness or inflammation or dryness of the eyes (noun.substance)

hypernym	:	fat-soluble vitamin,
definition	:	any vitamin that is soluble in fats (noun.substance)

hyponym	:	retinol, vitamin a1,
definition	:	an unsaturated alcohol that occurs in marine fish-liver oils and is synthesized biologically from carotene (noun.substance)

hyponym	:	dehydroretinol, vitamin a2,
definition	:	a viscous alcohol that is less active in mammals than is vitamin A1 (noun.substance)