空くう洞どうTop 15000MeaningsNoun1. cavity; hollow; cave; cavernNo-adjective2. hollowKanji used空empty air洞cavePitch accentくうどうUsed in vocabulary空くう洞どう化かmaking hollow; making meaningless; deindustrialization; deindustrialisationNoun空くう洞どう化か現げん象しょうhollowing-out phenomenonNoun超ちょう空くう洞どうvoidNoun空くう洞どう共きょう振しん器きcavity resonator; microwave resonance cavity; rhumbatronNoun脊せき髄ずい空くう洞どう症しょうsyringomyeliaNoun