名詞 micronutrient:

1. a substance needed only in small amounts for normal body function (e.g., vitamins or minerals)

mi.cro.nu.tri.ent

n.（名詞）
A substance, such as a vitamin or mineral, that is essential in minute amounts for the proper growth and metabolism of a living organism.
微量養(yǎng)料；微量營(yíng)養(yǎng)元素：一種對(duì)生物的正常生長(zhǎng)和新陳代謝極其重要的微量物質(zhì)，如一種維生素或礦物質(zhì)