柯林斯词典tannin /ˈtænɪn/ 1. N-UNCOUNT Tannin is a yellow or brown chemical that is found in plants such as tea. It is used in the process of making leather and in dyeing. 丹宁酸 返回 tannin剑桥词典(one of) a group of chemicals that are found in plant cells , especially in leaves , bark (= a tree's outer covering ), and fruit that is not yet ready to eat 丹宁（酸），鞣酸 返回 tannin