くう
空
どう
洞

noun

  1. cavity, hollow, cave, cavern.

takes genitive case の

  1. hollow.

Variations

Pronunciation Kanji Kana Is Common
くう
空
どう
洞
 空洞 くうどう ✔
くう
空
どう
胴
 空胴 くうどう

Contained Kanji Breakdown

empty, sky, void
そら　クウ　す.く (1st, N4)
hole, aperture, slit
あな　ケツ　けな (6th, N1)
shaped crown, katakana u radical (no. 40)
ベン　メン (Kentei 1)
dot, tick or dot radical (no. 3)
チュ (Kentei 1)
wa-shaped crown radical (no. 14)
ベキ (Kentei 1)
eight, eight radical (no. 12)
ハチ　や　はっ (1st, N5)
craft, construction, katakana e radical (no. 48)
コウ　ク　もく (2nd, N4)
den, cave, excavation
ドウ　とう　ほら (9th, N1)
water, water radical (no. 85)
さんずい
same, agree, equal
ドウ　おな.じ (2nd, N4)
upside-down box radical (no. 13)
キョウ　ケイ (Kentei 1)
delicious(旨) variant
one, one radical (no.1)
イチ　いっ　ひと- (1st, N5)
mouth
くち　コウ　ク (1st, N4)