空穴 kōngxué hole Origin Definitions Defs Strokes Stroke Words Sentences Sents kōngxué hole 空 kōng adjective empty empty; hollow; void of content; containing nothing穴 xué noun cave cave; hole; den; cavity; hollow in the ground or a buildingkōngxué electron hole 空 kòng adjective vacant unoccupied; blank; unused space; a gap or opening穴 xué noun cave cave; hole; den; cavity; hollow in the ground or a building