vitamin A
noun
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.
Origin of vitamin A
First recorded in 1920–25
British Dictionary definitions for vitamin a1
vitamin A
noun
a fat-soluble yellow unsaturated alcohol occurring in green and yellow vegetables (esp carrots), butter, egg yolk, and fish-liver oil (esp halibut oil). It is essential for the prevention of night blindness and the protection of epithelial tissue. Formula: C 20 H 30 O
Also called: vitamin A 1, retinol
Medical definitions for vitamin a1 (1 of 2)
vitamin A1
n.
A yellow crystalline compound extracted from egg yolks, milk, and cod-liver oil.
Medical definitions for vitamin a1 (2 of 2)
vitamin A
n.
A fat-soluble vitamin or a mixture of vitamins, especially vitamin A1 or a mixture of vitamins A1 and A2, occurring principally in fish-liver oils, milk, and some yellow and dark green vegetables, and functioning in normal cell growth and development with deficiencies causing hardening and roughening of the skin, night blindness, and degeneration of mucous membranes.
retinol
Scientific definitions for vitamin a1
vitamin A
A fat-soluble vitamin important for normal vision, tissue growth, and healthy skin. It is found in fish-liver oils, milk, green leafy vegetables, and red, orange, and yellow vegetables and fruits. A deficiency of vitamin A in humans causes poor vision at night and damage to the skin and mucous membranes. Also called retinol. Chemical formula: C20H30O.