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....

Vitamin

Chemical substances required in trace concentrations acting as a cofactor with enzymes in catalyzing biochemical reactions
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vitamin

[n] - any of a group of organic substances essential in small quantities to normal metabolism
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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...
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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.
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Vitamin

Substance in food, which we need in small amounts for cells to stay healthy
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Vitamin

Form of nutrient required in tiny amounts for essential metabolic reactions in living organisms
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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 deficienc...
Found on http://www.encyclo.co.uk/local/20973

vitamin

noun any of a group of organic substances essential in small quantities to normal metabolism
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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

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

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 q...
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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...
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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...
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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.
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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.
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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 ...
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VITAMIN

General term for a number of substances required in very small quantities for the normal functioning of the body's metabolic processes.
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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 (can dissolve in water). Excess fat-soluble vitami...
Found on http://www.cancer.gov/dictionary?expand=V

Vitamin

A vitamin (n and n) is an organic compound and a vital nutrient that an organism requires in limited amounts. An organic chemical compound (or related set of compounds) is called a vitamin when the organism cannot synthesize the compound in sufficient quantities, and must be obtained through the diet; thus, the term `vitamin` is conditional upon.....
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Vitamin

Small, organic compounds, necessary for proper metabolism, that are found in feed in minute amounts. Deficiencies result in distinct diseases or syndromes.
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VITAMIN

an organic substance that acts as a coenzyme or regulator of metabolic processes; vitamins are crucial for many vital bodily functions.
Found on http://www.encyclo.co.uk/local/22225

Vitamin

A substance that is critical for proper functioning of a living organism that the organism is unable
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Vitamin

Chemical substances required in trace concentrations acting as a cofactor with enzymes in catalyzing
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Vitamin

An organic compound essential in small quantities for normal body function. With few exceptions, vit
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