/paw ros"i tee, poh-, peuh-/ , n. , pl. porosities for 2.
1. the state or quality of being porous.
2. Geol. , Engin. the ratio, expressed as a percentage, of the volume of the pores or interstices of a substance, as a rock or rock stratum, to the total volume of the mass.
[ 1350-1400; ME porosytee porositas. See POROUS, -ITY ]