单词 | vitamin |
释义 | vitamin[ vahy-tuh-min; British also vit-uh-min ] / ˈvaɪ tə mɪn; British also ˈvɪt ə mɪn / SEE SYNONYMS FOR vitamin ON THESAURUS.COM nounany of a group of organic substances essential in small quantities to normal metabolism, found in minute amounts in natural foodstuffs or sometimes produced synthetically: deficiencies of vitamins produce specific disorders. Also vi·ta·mine [vahy-tuh-min, -meen; British also vit-uh-min, -meen]. /ˈvaɪ tə mɪn, -ˌmin; British also ˈvɪt ə mɪn, -ˌmin/. Origin of vitamin1912; earlier vitamine<Latin vīt(a) life + amine; coined by C. Funk, who thought they were amines OTHER WORDS FROM vitaminvi·ta·min·ic, adjectiveWords nearby vitaminvital signs, vital stain, vital staining, vital statistics, vitamer, vitamin, vitamin A, vitamin A1, vitamin A2, vitamin A acid, vitamin A aldehyde Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 Example sentences from the Web for vitaminBritish Dictionary definitions for vitaminvitamin / (ˈvɪtəmɪn, ˈvaɪ-) / nounany of a group of substances that are essential, in small quantities, for the normal functioning of metabolism in the body. They cannot usually be synthesized in the body but they occur naturally in certain foods: insufficient supply of any particular vitamin results in a deficiency disease Derived forms of vitaminvitaminic, adjectiveWord Origin for vitaminC20: vit- from Latin vīta life + -amin from amine; so named by Casimir Funk, who believed the substances to be amines Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012 Medical definitions for vitaminvitamin [ vī′tə-mĭn ] n.Any of various fat-soluble or water-soluble organic substances essential in minute amounts for normal growth and activity of the body and obtained naturally from plant and animal foods. The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company. Scientific definitions for vitaminvitamin [ vī′tə-mĭn ] Any of various organic compounds that are needed in small amounts for normal growth and activity of the body. Most vitamins cannot be synthesized by the body, but are found naturally in foods obtained from plants and animals. Vitamins are either water-soluble or fat-soluble. Most water-soluble vitamins, such as the vitamin B complex, act as catalysts and coenzymes in metabolic processes and energy transfer and are excreted fairly rapidly. Fat-soluble vitamins, such as vitamins A, D, and E are necessary for the function or structural integrity of specific body tissues and membranes and are retained in the body. A Closer LookAlthough it has been known for thousands of years that certain diseases can be treated with specific foods, the scientific link between vitamins and good health wasn't made until the early 1900s by Polish-born American biochemist Casimir Funk. While studying beriberi, a disease that causes depression, fatigue, and nerve damage, Funk discovered an organic compound in rice husks that prevents the illness. He named the compound vitamine, derived from the chemical name amine and the Latin word vita, "life," because vitamins are required for life and were originally thought to be amines. Funk's compound is now known as vitamin B1, or thiamine. His research and discovery led him, along with English biochemist Sir Frederick Gowland Hopkins, to propose the vitamin hypothesis of deficiency, which stated that certain diseases, such as scurvy or rickets, are caused by dietary deficiencies and can be avoided by taking vitamins. Further research allowed scientists to isolate and identify the vitamins that we know today to be essential for human health. Vitamins include A, C, D, E, K, thiamine, riboflavin, niacin, B6, B12, folic acid, biotin, and pantothenic acid. Vitamins are distinguished from minerals, such as calcium, iron, and magnesium, which are also essential for optimum health. The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved. |
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