[¦ī·sə¦prō·pəl ¦fȯr ¦fȯr‚prīm dī‚klȯr·ō′ben·zə‚lāt] (organic chemistry) C17H16O3Cl2 A white powder with a melting point of 70-72°C; solubility in water is less than 10 parts per million at 20°C; used as a miticide for spider mites on apple and pear trees.