Zi:凹
凹 [āo] sunken/depression, low-lying (低凹); concave (凹透镜 concave lens); uneven (凹凸不平); 凹凸印 embossing [wā] (又读); cf. 窊/洼; (component: 兕𤉡𧰽𧱃𩡿…)
2 monosyllabic entries in The ABC Cantonese-English Dictionary (namespace Jyut):
3 monosyllabic entries in The ABC Chinese-English Comprehensive Dictionary (namespace Ci):
►¹āo 凹 {D} v. concave; sunken; dented
►⁴wā 洼/凹[窪/-] {E} v. be hollowed-out; low-lying ◆n. low-lying area; depression M: piàn/²kuài 片/块
►⁴wā 洼/凹[窪/-] {E} v. be hollowed-out; low-lying ◆n. low-lying area; depression M: piàn/²kuài 片/块
The character 凹 āo/wā ‘sunken/depression/hollow/concavity’ represents the female shape (⚋), opposite to the protruding male shape 凸 tū ‘bulging/convex’ (⚊); the two shapes fit together like lock and key (if one shape is inverted); formerly wr. 坳(黝) ào/āo ‘dark hollow’, and 窊() wā ‘low-lying’.
Note: Only the reading 凹 āo is standard, though 凹 wā is still common; 凹 wā is properly wr. 洼.
Compare: 曲(𠤬) qū ‘curved’; 凵() qiǎn ‘open mouth’; 匚(𠥓) fāng ‘square vessel/basket’.
Compare: 兕𤉡𧰽𧱃𩡿𪵲𠚆𧱣𧣶㾎垇𠈿𠱃𢍭
HDZ: 凹 : āo : 孤低于周围 (ant. 凸) (cf. 坳) • wā : (又读)
►references: Guǎngyùn:544.15; Wieger:177; Hànyǔ Dà Zìdiǎn:1.308.3; Lindqvist:333; Mathews:7268; Kāngxī Zìdiǎn:135.10; Bǐshùn Guīfàn:016.0.03
►components: 凵
►Cantonese: aau- nap\ wa\
<cdl char='凹' uni='51F9' points='4,4 124,124' radical='D1 Z1'>
<stroke type='s' points='0,0 0,128' tail='long' />
<stroke type='hzz' points='0,0 40,0 40,60 88,60' head='cut' tail='cut' />
<stroke type='s' points='88,0 88,60' tail='long' />
<stroke type='hz' points='88,0 128,0 128,128' head='cut' tail='long' />
<stroke type='h' points='0,128 128,128' head='cut' tail='cut' />
</cdl>
►stroke 凹 (... strokes)
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Unicode: U+51F9
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