Nantoka/黑洞hēi dòng黑洞 (hēi dòng) is a Chinese word meaning “(astronomy) black hole”.Meanings1(astronomy) black holeCharacters in 黑洞黑hēi · black洞dòng · caveRelated words黑black黑short name for Heilongjiang 黑龍江|黑龙江[Hei1 long2 jiang1]黑人black person黑暗dark洞cave洞used in 洪洞[Hong2 tong2] (the name of a place in Shanxi)黑色black黑帮bunch of gangsters洞穴cave漏洞leak黑夜night黑手党mafiaStudy Chinese with flashcards →