megaohm (megohm) centimeter

   a unit of resistivity, used for pure water and for other substances having relatively high resistivity. In the case of water, resistivity is a measure of purity: the higher the purity, the higher the resistivity. The resistivity of a conductor in megaohm centimeters is defined to be its resistance (in megaohms) multiplied by its cross-sectional area (in square centimeters) divided by its length (in centimeters). One megaohm centimeter equals 10 000 ohm meters.