洞 どう Meanings Noun sinus; cavity; antrum neighborhood (administrative division in North Korea) Kanji 洞 cavern. Read as ドウ. Words containing 洞 洞窟 (どうくつ) cave 空洞 (くうどう) cavity 洞穴 (ほらあな) cave And 42 more. Word lists Anatomy Jinuma: Japanese Dictionary · Word lists