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A substance required in relatively large amounts for the normal growth and development of an organism. Macronutrients for animals include fat, carbohydrate, and protein, while for most plants they include chemical elements such as carbon, hydrogen, oxygen, nitrogen, and phosphorus.
(Biochemistry) any substance, such as carbon, hydrogen, or oxygen, that is required in large amounts for healthy growth and development
mac•ro•nu•tri•ent(ˌmæk roʊˈnu tri ənt, -ˈnyu-)
1. any of the nutritional components required in relatively large amounts: protein, carbohydrate, fat, and the essential minerals.
2. any of the chemical elements required by plants in relatively large amounts: nitrogen, phosphorus, and potassium.
macronutrient- One required in relatively large amounts by organisms, e.g. carbohydrates, fats, and proteins.
See also related terms for organism.