/mak'roh nooh"tree euhnt, -nyooh"-/ , n.
1. Nutrition. any of the nutritional components of the diet that are required in relatively large amounts: protein, carbohydrate, fat, and the macrominerals.
2. Bot. any of the three chemical elements required by plants in relatively large amounts: nitrogen, phosphorus, and potassium. Cf. micronutrient .
[ 1940-45; MACRO- + NUTRIENT ]