- the state or condition of being porous
- the ratio of the volume of space to the total volume of a rock
WordReference Random House Unabridged Dictionary of American English © 2026
po•ros•i•ty
(pô ros′i tē, pō-, pə-),USA pronunciation n., pl. -ties for 2.
- the state or quality of being porous.
- Geologythe 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.
- Medieval Latin porōsitās. See porous, -ity
- Middle English porosytee 1350–1400
Collins Concise English Dictionary © HarperCollins Publishers::
porosity /pɔːˈrɒsɪtɪ/ n ( pl -ties)
po•rous /ˈpɔrəs/USA pronunciation
adj.
WordReference Random House Unabridged Dictionary of American English © 2026- Physicsallowing water, air, etc., to pass through.
- Botanyfull of pores.
po•rous
(pôr′əs, pōr′-),USA pronunciation adj.
po′rous•ly, adv.
po′rous•ness, n.
- Botanyfull of pores.
- Physicspermeable by water, air, etc.
- Medieval Latin porōsus. See pore2, -ous
- Middle English, variant of porose 1350–1400
po′rous•ness, n.
- 2. penetrable, pervious, sievelike, riddled.
'porosity' also found in these entries (note: many are not synonyms or translations):