凹	570C25   40.40	部居	畫數  5	ㄠ [ao1]  (also *ㄨㄚˋ [wa4] , *ㄧㄠ [yao1] ).
Adj	Concave (surface), hollow, depressed: 凸凹 convex and concave; 凹地，凹處 [ao1di4], [ao1chu4]↓ (related 窪 62C.11).
Words	1.凹版 [ao1ban3], n., a die cut with designs or characters in intaglio.  2.凹處 [ao1chu4], n., hollow place, depression.  3.凹地 [ao1di4], n., hollow ground.  4.凹鏡 [ao1jing4], n., a concave mirror.  5.凹心臉兒 *[ao1xin1lia3er0], n., a face hollow below the cheekbones.  6.凹透鏡 [ao1tou4jing4], n., concave lens.  7.凹瑤兒 *[wa4yao2er0], n., a depression on a plane or surface.