凹面 āomiàn concavity Origin Definitions Defs Strokes Stroke Words Sentences Sents 凹面镜 āomiànjìng concave mirror A spherical mirror with a reflective surface that curves inward, used to focus light; also called [[凹镜|凹鏡|ao1 jing4]] or [[会聚镜|會聚鏡|hui4 ju4 jing4]].