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单词 vitamin b
释义

WordReference Random House Unabridged Dictionary of American English © 2024
vitamin B1, 
  1. thiamine.
  • 1920–25

vitamin B2, 
  1. riboflavin.
  • 1925–30

vitamin B3, 
  1. NutritionSee nicotinic acid. 

vitamin B6, 
  1. pyridoxine.
  • 1930–35

vitamin B9, 
  1. See folic acid. 

vitamin B12, 
  1. a deep-red crystalline, water-soluble solid, C63H88N14O14PCo, obtained from liver, milk, eggs, fish, oysters, and clams: a deficiency causes pernicious anemia and disorders of the nervous system. Also called cyanocobalamin, cobalamin, extrinsic factor. 
  • 1945–50

Collins Concise English Dictionary © HarperCollins Publishers::
vitamin B n ( pl B vitamins)
  1. any of the vitamins in the vitamin B complex
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