凸凸 Save Sign in to save words tūtū ㄊㄨ ㄊㄨ convex on both sides (of lens) biconvex Character by character 凸(tū)stick out 凸(tū)stick out Other words read tūtū In the same tone 突突 A Chinese word or character, or English Search Sources CC-CEDICT, CC BY-SA 4.0 pinyinjs, Apache-2.0