Look up: vitamin

1. Vitamin
   Chemical substances required in trace concentrations acting as a cofactor with enzymes in catalyzing biochemical reactions
   Found on http://life.bio.sunysb.edu/marinebio/glo
   
   
2. Vitamin
   An organic compound which occurs in very small amounts in most vegetable matter without which normal functions may not proceed. There are many different ones and they were originally distinguished by letters of the alphabet, vitamin A, B, C, etc. Often referred to by a name indicating their chemical composition, eg. panthothenic acid, riboflavin, cyanocabalamine, etc. Absence of any one in the diet produces a specific syndrome. Continued complete absence can result in death. Some animals appear to be able to manufacture their own requirements of certain vitamins.
   Found on http://www.encyclo.co.uk/visitor-contrib
   
   
3. vitamin
   [n] - any of a group of organic substances essential in small quantities to normal metabolism
   Found on http://www.webdictionary.co.uk/definitio
   
   
4. Vitamin
   A substance that is critical for proper functioning of a living organism that the organism is unable to produce in sufficient quantities for itself. They were first named by Dr Casimir Funk in 1912.Vitamin A Vitamin A (carotene) occurs in certain fats and the fatty parts of some foods. Also found in...
   Found on http://www.diracdelta.co.uk/science/sour
   
   
5. vitamin
   A substance that is critical for proper functioning of a living organism that the organism is unable to produce in sufficient quantities for itself.
   Found on http://antoine.frostburg.edu/chem/senese
   
   
6. Vitamin
   Substance in food, which we need in small amounts for cells to stay healthy
   Found on http://www.makingsenseofhealth.org.uk/de
   
   
7. Vitamin
   Form of nutrient required in tiny amounts for essential metabolic reactions in living organisms
   Found on http://www.researchautism.net/glossary.i
   
   
8. vitamin
   <biochemistry> An essential low molecular weight organic compound required in trace amounts for normal growth and metabolic processes. They usually serve as components of coenzyme systems. ... For humans Vitamin A, the B series, C, D1 and D2, E and K are required. Deficiencies of one or more v...
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9. vitamin
   noun any of a group of organic substances essential in small quantities to normal metabolism
   Found on http://wordnetweb.princeton.edu/perl/web
   
   
10. vitamin
    (vi´tә-min) any of a group of organic substances found in foods and essential in small quantities for growth, health, and the preservation of life itself. The body needs vitamins just as it requires other food constituents such as proteins, fats, carbohydrates, minerals, and water. The absence of one or more vitam...
    Found on http://www.encyclo.co.uk/local/21001
    
    
11. vitamin
    any of several organic substances that are necessary in small quantities for normal health and growth in higher forms of animal life. Vitamins are ... [26 related articles]
    Found on http://www.britannica.com/eb/a-z/v/30
    
    
12. vitamin
    vitamin 1. Any of various unrelated organic substances that occur in many foods in small amounts and which are necessary in trace amounts for the normal metabolic functioning of the body. They may be water-soluble or fat-soluble. 2. An organic substance essential in small quantities to the metaboli...
    Found on http://www.wordinfo.info/words/index/inf
    
    
13. vitamin
    vitamin, group of organic substances that are required in the diet of humans and animals for normal growth, maintenance of life, and normal reproduction. Vitamins act as catalysts; very often either the vitamins themselves are coenzymes, or they form integral parts of coenzymes. A substance that fun...
    Found on http://www.infoplease.com/ce6/sci/A08510
    
    
14. Vitamin
    Vitamins are chemical substances which are used by animal bodies for growth and repair of certain tissues and cells. They were first named by Dr Casimir Funk in 1912.
    Found on http://www.probertencyclopaedia.com/brow
    
    
15. vitamin
    Type: Term Pronunciation: vī′tă-min Definitions: 1. One of a group of organic substances, present in minute amounts in natural foodstuffs, that are essential to normal metabolism; insufficient amounts in the diet may cause deficiency diseases.
    Found on http://www.medilexicon.com/medicaldictio
    
    
16. vitamin
    Any of various chemically-unrelated organic (carbon-containing) compounds that are necessary in small quantities for the normal functioning of the mammalian body. Many act as coenzymes, small molecules that enable enzymes to function effectively. Vitamins must be supplied by the diet because ...
    Found on http://www.talktalk.co.uk/reference/ency
    
    
17. VITAMIN
    General term for a number of substances required in very small quantities for the normal functioning of the body's metabolic processes.
    Found on http://www.thehorse.com/Glossary.xhtml?L
    
    
18. vitamin
    A nutrient that the body needs in small amounts to function and stay healthy. Sources of vitamins are plant and animal food products and dietary supplements. Some vitamins are made in the human body from food products. Vitamins are either fat-soluble (can dissolve in fats and oils) or water-soluble ...
    Found on http://www.cancer.gov/dictionary?expand=
    
    
19. Vitamin
    A `vitamin` is an organic compound required as a nutrient in tiny amounts by an organism.<ref name="Lieberman">Lieberman, S, Bruning, N (1990). The Real Vitamin & Mineral Book. NY: Avery Group, 3, ISBN 0895297698--> In other words, an organic chemical compound (or related set of com...
    Found on http://en.wikipedia.org/wiki/Vitamin