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]
Source: Stedman's Medical Spellchecker, © 2006 Lippincott Williams & Wilkins. All rights reserved.
Vitamin: A key nutrient that the body needs in small amounts to grow and stay strong. Examples are vitamins A, C, and E.
Source: National Institute of Health
Vitamin: A group of organic food substances found in animals and plants in small quantities. They must be supplied in diet or dietary supplement and are essential for normal metabolism.
Source: Diseases Database
Vitamin: diverse group of organic nutrient substances required in trace amounts for normal metabolic function; many are enzyme cofactors or cofactor precursors.
Source: CRISP
Vitamin: Organic substances that are required in small amounts for maintenance and growth, but which cannot be manufactured by the human body.
Source: MeSH 2007
Source - MeSH 2007
Source - CRISP
Source - MeSH 2007
Source - CRISP
Source: CRISP
The following list attempts to classify Vitamin into categories where each line is subset of the next.
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