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Definition of Micronutrient
1. Noun. A substance needed only in small amounts for normal body function (e.g., vitamins or minerals).
Definition of Micronutrient
1. [n -S]
Medical Definition of Micronutrient
1. 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)