vitamin A

a yellow, fat-soluble, solid terpene alcohol, C20H30O, obtained from carotene and occurring in green and yellow vegetables, egg yolk, etc.: essential to growth, the protection of epithelial tissue, and the prevention of night blindness. Also called vitamin A1, retinol.

vitamin A2,

a yellow oil, C20H28O, similar to vitamin A, obtained from fish liver.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

vitaminvitamin A aldehyde
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