What does "vitamin a" mean?

Any of several closely related fat-soluble vitamins that are essential for normal vision; retinol.

Vitamin a

Common synonyms include: a, antiophthalmic factor, axerophthol, fortificant, preformed vitamin a, retinol.

noun

noun ·Rare ·Advanced level

Noun

1
Any of several closely related fat-soluble vitamins that are essential for normal vision; retinol. uncountable
2
any of several fat-soluble vitamins essential for normal vision; prevents night blindness or inflammation or dryness of the eyes wordnet