| Trad. | Simp. | Pinyin | English |
| 凹 | āo | a depression; indentation; concave; hollow | |
| 凹岸 | āo àn | concave bank | |
| 凹板 | āo bǎn | intaglio; gravure | |
| 凹槽 | āo cáo | socket | |
| 凹洞 | āo dòng | cavity; pit | |
| 凹度 | āo dù | concavity | |
| 凹臉蝠科 | 凹脸蝠科 | āo liǎn fú kē | bumblebee bat |
| 凹面鏡 | 凹面镜 | āo miàn jìng | concave mirror |
| 凹透鏡 | 凹透镜 | āo tòu jìng | concave lens |
| 凹凸印刷 | āo tū yìn shuā | embossing; die stamping | |
| 凹凸軋花 | 凹凸轧花 | āo tū zhá huā | embossing |
| 凹陷 | āo xiàn | hollow; sunken; depressed | |
| 夜凹臉蝠科 | 夜凹脸蝠科 | Yè āo liǎn fú kē | Nycteridae |
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