source: By Biofilter tech - Template:Cermedia L.L.C., CC BY-SA 3.0

(of a rock or other material) having minute spaces or holes through which liquid or air may pass:

〈物･物質などが〉通水［通気］性の; 〈物質(の表面)などが〉多孔性の

e.g. layers of porous limestones

e.g. some rocks are more porous than others.

not retentive or secure:

｟比喩的に｠ 〈法律などが〉抜け道の多い; 〈記憶などが〉忘れやすい

e.g. he ran through a porous defense to score easily.

porosity |pəˈräsədē| noun

porously adverb

porousness |ˈpôrəsnəs| noun

late Middle English: from Old French poreux, based on Latin porus ‘pore’.