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  • 洞ほら

    hollow, cavity, hole, cave

  • 洞窟どうくつ

    cave, cavern, grotto

  • 洞穴ほらあな

    cave, cavern, den, grotto

  • 洞察どうさつ

    discernment, insight

  • 空洞くうどう

    cavity, hollow, cave, cavern

  • 鍾乳洞しょうにゅうどう

    limestone cave, limestone cavern

  • 洞どう

    sinus, cavity, antrum

  • 洞角どうかく

    hollow horn, cavicorn

  • 洞見どうけん

    insight, discernment

  • 洞門どうもん

    cave entrance, tunnel

  • 洞毛どうもう

    (animal) whiskers, vibrissae

  • 洞道とうどう

    service tunnel (cables, gas, etc.)

  • 洞房どうぼう

    sinoatrial

  • 洞簫どうしょう

    dongxiao (Chinese bamboo flute similar to a shakuhachi)

  • 膣洞ちつどう

    vaginal cavity, vagina

  • 仙洞せんとう

    residence of a retired emperor, dwelling of a former emperor

  • 風洞ふうどう

    wind tunnel

  • 窩洞かどう

    dental cavity (due to caries)

  • 樹洞じゅどう

    tree hollow, hollow in a tree

  • 類洞るいどう

    sinusoid

  • 雪洞せつどう

    snow cave

  • 雪洞ぼんぼり

    paper-covered lamp or lantern

  • 晶洞しょうどう

    druse, globular calcium oxalate crystals, often lining a rock cavity

  • 洞調律どうちょうりつ

    sinus rhythm

  • 洞井守ほらいもり

    olm (Proteus anguinus)

  • 洞結節どうけっせつ

    sinus node, sinoatrial node

  • 洞窟熊ほらあなぐま

    cave bear (extinct, Ursus spelaeus)

  • 洞察力どうさつりょく

    insight, discernment, perception, perspicacity, acumen

  • 静脈洞じょうみゃくどう

    venous sinus, sinus venosus

  • 曹洞禅そうとうぜん

    Soto Zen

  • 曹洞宗そうとうしゅう

    Soto school (of Zen Buddhism)

  • 空洞化くうどうか

    making hollow, making meaningless

  • 晶洞石しょうどうせき

    geode

  • 石灰洞せっかいどう

    limestone cave

  • 小洞燕しょうどうつばめ

    sand martin (Riparia riparia)

  • 海食洞かいしょくどう

    sea cave, marine cave

  • 溶岩洞ようがんどう

    lava tube

  • 超空洞ちょうくうどう

    void

  • 洞窟潜水どうくつせんすい

    cave diving

  • 洞窟壁画どうくつへきが

    cave painting

  • 洞房結節どうぼうけっせつ

    sinoatrial node

  • 溶岩洞穴ようがんほらあな

    lava cave

  • 洞性不整脈どうせいふせいみゃく

    sinus arrhythmia, irregular heartbeat

  • 洞窟の女王どうくつのじょおう

    She: a History of Adventure (1887 novel by H. Rider Haggard)

  • 空洞化現象くうどうかげんしょう

    hollowing-out phenomenon

  • 台湾小洞燕たいわんしょうどうつばめ

    brown-throated martin (Riparia paludicola), brown-throated sand martin

  • 空洞共振器くうどうきょうしんき

    cavity resonator, microwave resonance cavity, rhumbatron

  • 洞不全症候群どうふぜんしょうこうぐん

    sick sinus syndrome, sinus node dysfunction, SSS

  • 洞爺湖サミットとうやこサミット

    G8 Hokkaido Toyako Summit, Hokkaido Toyako G8 summit

  • 洞ヶ峠を決め込むほらがとうげをきめこむ

    to wait for a good opportunity, to come down on the right side of the fence, to see which way the cat jumps, to wait and see at Horagatoge

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