Look up: Vitamin

1. 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://fas.org/news/reference/probert/AD
   
   
2. 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
   
   
3. 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.pestmanagement.co.uk/lib/glos
   
   
4. vitamin
   [n] - any of a group of organic substances essential in small quantities to normal metabolism
   Found on http://www.webdictionary.co.uk/definitio
   
   
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. 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 carrots and tomatoes. It is used by the human bod…
   Found on http://www.diracdelta.co.uk/science/sour
   
   
6. 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
   
   
7. Vitamin
   Substance in food, which we need in small amounts for cells to stay healthy
   Found on http://www.makingsenseofhealth.org.uk/de
   
   
8. Vitamin
   Form of nutrient required in tiny amounts for essential metabolic reactions in living organisms
   Found on http://www.researchautism.net/glossary.i
   
   
9. 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 vitamins in the nutrient supply result in deficiency …
   Found on http://cancerweb.ncl.ac.uk/cgi-bin/omd?v
   
   
10. vitamin
    noun any of a group of organic substances essential in small quantities to normal metabolism
    Found on http://wordnet.princeton.edu/perl/webwn?
    
    
11. Vitamin
    A `vitamin` is a nutrient that is an organic compound required in tiny amounts for essential metabolic reactions in a living organism. Most vitamins cannot be obtained in sufficient quantities by synthesis in the body, and therefore must be obtained from the diet. Thus, the term is conditional on the circumstances and the particular living organism. For example, ascorbic acid functions as vitamin C for some animals but not others, and vitamins D ...
    Found on http://en.wikipedia.org/wiki/Vitamin
    
    
12. Vitamin
    A `vitamin` is a nutrient that is an organic compound required in tiny amounts for essential metabolic reactions in a living organism. Most vitamins cannot be obtained in sufficient quantities by synthesis in the body, and therefore must be obtained from the diet. Thus, the term is conditional on the circumstances and the particular living organism. For example, ascorbic acid functions as vitamin C for some animals but not others, and vitamins D ...
    Found on http://en.wikipedia.org/wiki/Vitamin
    
    
13. 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.mercksource.com/pp/us/cns/cns
    
    
14. 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
    
    
15. 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 metabolism in most animals. Vitamins are found in minute quantit...
    Found on http://www.wordinfo.info/words/index/inf
    
    
16. vitamin
    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. [L. vita, life, + amine]
    Found on
    
    
17. vitamin
    The structure of some vitamins. Closely related compounds often have similar metabolic effects, thus vitamin B₆ exists in aldehyde and amine forms as well as the alcohol shown here. An organic molecule needed in trace amounts for normal growth and metabolic processes. Vita...
    Found on http://www.daviddarling.info/encyclopedi