Adjacent Words

vitamin A definitions

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WordNet (r) 3.0 (2005)

n
1: any of several fat-soluble vitamins essential for normal vision; prevents night blindness or inflammation or dryness of the eyes [syn: vitamin A, antiophthalmic factor, axerophthol, A]

Merriam Webster's

noun Date: circa 1920 any of several fat-soluble vitamins (as retinol) found especially in animal products (as egg yolk, milk, or fish-liver oils) or a mixture of them whose lack in the animal body causes epithelial tissues to become keratinous (as in the eye with resulting visual defects)