洞 ほら Meanings Noun hollow; cavity; hole; cave Kanji 洞 cavern. Read as ほら. Words containing 洞 洞穴 (ほらあな) cave 溶岩洞穴 (ようがんほらあな) lava cave 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 Jinuma: Japanese Dictionary · Word lists