凹

中央凹

zhōng yāng āo

fovea centralis (depression in the macula retina, most sensitive optic region)

凹入

āo rù

recessed

凹凸

āo tū

concave or convex

凹凸不平

āo tū bù píng

(idiom) uneven (surface); bumpy (road)

凹凸印刷

āo tū yìn shuā

embossing

凹凸形

āo tū xíng

crenelated; corrugated

凹凸性

āo tū xìng

(math.) concavity

凹凸有致

āo tū yǒu zhì

curvaceous

凹凸轧花

āo tū yà huā

embossing

凹坑

āo kēng

concave depression

凹岸

āo àn

concave bank

凹度

āo dù

concavity