macronutrient
/ˌmækrəʊˈnjuːtrɪənt/noun
1- Biology a substance required in relatively large amounts by living organisms, in particular【生】大量养料; 常量营养物, 尤指：
1.1
- a type of food (e.g. fat, protein, carbohydrate) required in large amounts in the diet主要养分（如脂肪、蛋白质、碳水化合物）。
1.2
- a chemical element (e.g. potassium, magnesium, calcium) required in large amounts for plant growth and development常量营养素（如钠、钾、钙）。