I. “+ noun
Etymology: micr- + nutrient
1. : trace element
2. : an organic compound (as a vitamin) essential in minute amounts only to the growth and welfare of an animal — compare macronutrient
II. adjective
: of, relating to, or being a micronutrient
micronutrient deficiency
: required for nutrition only in minute amounts
micronutrient elements such as manganese and zinc — Science