Kalmar "biprism" yawanci tana nufin kayan aikin kimiyya wanda ya ƙunshi prisms biyu da ake amfani da su don tsaga haske ko auna tsawon lokacin haske. An samo shi daga kalmomin "bi" ma'ana biyu da "prism" ma'ana prism mai siffar triangular da ake amfani da shi don kawar da haske.
