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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Collins
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
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Encyclopedia Britannica
Encyclopedia

micronutrient

in biology, any chemical element required by living organisms in minute amounts, usually as part of a vital enzyme, a cell-produced catalytic protein. Exact needs vary among species, but commonly required plant micronutrients include copper, boron, zinc, manganese, and molybdenum. Animals also require manganese, iodine, and cobalt. Lack of a necessary plant micronutrient in the soil causes plant deficiency diseases; lack of animal micronutrients in the soil may not harm the plants, but, without them, animals feeding solely on those plants develop deficiency diseases.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Many more have micronutrient deficiencies: they do not get essential vitamins or minerals in their diets.
Phytochemicals are the micronutrient of this generation.
Likewise, popcorn contains lutein, a micronutrient that also has anti-inflammatory characteristics.
Folate is a micronutrient important for genetic processes.
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