/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 < ML porositas. See POROUS, -ITY]

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Universalium. 2010.