vitamin A

Từ điển WordNet v3.1 - WordNet Dictionary

noun

any of several fat-soluble vitamins essential for normal vision;
prevents night blindness or inflammation or dryness of the eyes
• Syn:
antiophthalmic factor, axerophthol, A
• Hypernyms:
fat-soluble vitamin
• Hyponyms:
vitamin A1, retinol, vitamin A2, dehydroretinol