| micronutrient | A vitamin or mineral that the body must obtain from outside sources. Micronutreints are essential to the body in small amounts because they are either components of enzymes (the minerals) or act as coenzymes in managing chemical reactions. See: Vitamin. (09 Oct 1997) |
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| micronutrients | Essential dietary elements required only in small quantities. They are present in the body in amounts less than .005% of body weight. (12 Dec 1998) |