柯林斯词典auxin /ˈɔːksɪn/ 1. N any of various plant hormones, such as indoleacetic acid, that promote growth and control fruit and flower development. Synthetic auxins are widely used in agriculture and horticulture 植物生长素 返回 auxin剑桥词典a chemical substance that controls growth in plants 茁长素（植物生长素） 返回 auxin