| āo | a depression/indentation/concave/hollow |
| 凹 | a depression indentation concave |
| 凹入 | cavity convex opening |
| 凹凸 | bumpy uneven slotted and tabbed joint |
| 凹凸不平 | to be bumpy uneven |
| 凹凸印刷 | embossing die stamping |
| 凹凸印刷机 | die stamping press |
| 凹凸形 | in and out shape crenelated |
| 凹凸的 | concavo-convex; concave convex; concaveconvex; concavoconvex; meniscoid |
| 凹凸纹 | raised grain |
| 凹凸轧花 | embossing |
| 凹凸透镜 | meniscuslens; meniscus; concavo convex lens; meniscus lens; positive meniscus; periscopic lens; concave-convex lens |
| 凹凸镜 | concave and convex lenses |
| 凹刻 | to intaglio |
| 凹刻印刷 | [Printing] intaglio |
| 凹口 | notch; gap; dap; Nick; warped finish; slot |
| 凹地 | valley; kar; mulde; depression; hollow; delve; hgollow; caulbron |
| 凹坑 | concave depression crater |
| 凹处 | pocket; trough; concavity; scoop; pothole; concave; recess; cavity; sinus |
| 凹字 | character cut in bas-relief |
| 凹室 | alcove; recessed room |