開三次方 kāisāncìfāng to extract a cube root Origin Definitions Defs Strokes Stroke Words Sentences Sents 开 開 kāi verbparticle to open to open; to unfold; to unseal; (of flowers) to bloom; to carve or cut open三次方 sāncìfāng cube the product of a number multiplied by itself two additional times (e.g., x * x * x), also known as the third power in mathematics