Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A substance, such as a vitamin or mineral, that is essential in minute amounts for the proper growth and metabolism of a living organism.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun A mineral, vitamin or other substance that is essential, even in very small quantities, for growth or metabolism

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun a substance needed only in small amounts for normal body function (e.g., vitamins or minerals)

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