凸 tū — convex; protruding; bulging 凸 tū Level 1 · Common HSK 7-9 #229 tū tu1 Basic definition adjective convex; protruding; bulging e.g 凸出凸起凸透镜 Detailed explanation adjective convex;raised gibbous verb protrude project Related words 凸显 tū xiǎn to show prominently; to highlight; to manifest 凸现 tū xiàn to come to prominence/to appear clearly/to stick out 凸出 tū chū to protrude; to bulge; to stick out 凸起 tū qǐ bulging; protruding 凹凸 āo tū concave-convex; uneven; rugged 凸轮 tū lún cam 凸版 tū bǎn relief printing plate 凸透镜 tū tòu jìng convex lens