micro nutrient

micronutrient

[mahy-kroh-noo-tree-uhnt, -nyoo-]
noun Biochemistry.
an essential nutrient, as a trace mineral or vitamin, that is required by an organism in minute amounts.

Origin:
1935–40; micro- + nutrient

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World English Dictionary
micronutrient (ˌmaɪkrəʊˈnjuːtrɪənt)
 
n
any substance, such as a vitamin or trace element, essential for healthy growth and development but required only in minute amounts

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

micronutrient mi·cro·nu·tri·ent (mī'krō-nōō'trē-ənt, -nyōō'-)
n.
A substance, such as a vitamin or mineral, that is essential in minute amounts for the proper growth and metabolism of a living organism.

The American Heritage® Stedman's Medical Dictionary
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