白口 báikǒu white mouth Origin Definitions Defs Strokes Stroke Words Sentences Sents 白口铁 báikǒutiě white iron A type of cast iron characterized by a white fracture surface; it is hard, brittle, and primarily used in steelmaking or for machine tool bases.牙白口清 yábáikǒuqīng to speak distinctly To speak clearly and distinctly; to be articulate.