黑洞 hēidòng black hole Origin Definitions Defs Strokes Stroke Words Sentences Sents hēidòng black hole 黑 hēi adjective black the color of coal or ink; opposite of 白 bái洞 dòng noun hole hole; cavity; cavehēidòng dark hole 黑 hēi adjectiveverb dark lacking light; dim; night or nightfall洞 dòng noun hole hole; cavity; cavehēidòng underworld 黑 hēi noun wicked sinister; vicious; heartless; cruel洞 dòng noun hole hole; cavity; cave