Etymology
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porosity (n.)

"state or quality of containing pores," late 14c., porosite, from Old French porosité, from Medieval Latin porositas (13c.), from Latin porus (see pore (n.)).

updated on September 04, 2020

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Definitions of porosity from WordNet

porosity (n.)
the property of being porous; being able to absorb fluids;
Synonyms: porousness
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.