Definitions for macronutrientˌmæk roʊˈnu tri ənt, -ˈnyu-
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Random House Webster's College Dictionary
mac•ro•nu•tri•entˌmæk roʊˈnu tri ənt, -ˈnyu-(n.)
any of the nutritional components required in relatively large amounts: protein, carbohydrate, fat, and the essential minerals.
Category: Nutrition
any of the chemical elements required by plants in relatively large amounts: nitrogen, phosphorus, and potassium.
Category: Botany
Origin of macronutrient:
1940–45
Wiktionary
macronutrient(Noun)
Any of the elements required in large amounts by all living things.
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"macronutrient." Definitions.net. STANDS4 LLC, 2013. Web. 20 May 2013. <http://www.definitions.net/definition/macronutrient>.