vitamin A

noun

a yellow, fat-soluble, solid terpene alcohol, C 20 H 30 O, 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.

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 calledvitamin A1retinol

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: C 20 H 30 O.

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Word History and Origins

Origin of vitamin A¹

First recorded in 1920–25

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Example Sentences

Examples have not been reviewed.

He's been telling parents to overdose kids with vitamin A, which can cause liver damage.

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In one of several Mennonite-owned natural-health stores in Seminole, dozens of bottles of cod liver oil - a supplement that contains vitamin A - are on display.

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He has said vitamin A can treat a measles outbreak in Texas, and has named vaccine skeptic David Geier to help study whether vaccines are connected to autism — a theory that has been discredited.

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As parents near the outbreak in Texas stocked up on vitamin A supplements, doctors there raced to assure parents that only vaccination, not the vitamin, can prevent measles.

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Department of Health and Human Services secretary, promoted vitamin A and cod liver oil as effective treatments.

From

vitamin vitamin A2

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