micronutrient
noun
mi·cro·nu·tri·ent
ˌmī-krō-ˈnü-trē-ənt
-ˈnyü-
: a chemical element or substance (such as calcium or vitamin C) that is essential in minute amounts to the growth and health of a living organism see trace element compare macronutrient
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Merriam-Webster unabridged
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