Definition of macronutrient
1 : a chemical element (as nitrogen, phosphorus, or potassium) of which relatively large quantities are essential to the growth and health of a plant
2 : a substance (as protein or carbohydrate) essential in large amounts to the growth and health of an animal — compare micronutrient 2
First Known Use of macronutrient
Medical Definition of macronutrient
: a chemical element or substance (as protein, carbohydrate, or fat) required in relatively large quantities in nutrition
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