WHAT IS MegaOhm centimeters?

A megaOhm.cm is a unit of electrical resistance (Note: Centimeters here are multipliers, not denominators). It is equivalent to the unit microS/cm, where S represents Siemens. 1 S = 1/Ohm Some notation uses the inverse term, mho, as in 1 micromho.cm. 1 mho = 1/Ohm = 1 S