閉子集 Save Sign in to save words Simplified: 闭子集 bìzǐjí ㄅㄧˋ ㄗˇ ㄐㄧˊ closed subset (math.) Character by character 閉(bì)close 子(zǐ)son 集(jí)gather A Chinese word or character, or English Search Sources CC-CEDICT, CC BY-SA 4.0 pinyinjs, Apache-2.0