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English definition of “porous”

porous

adjective     /ˈpɔː.rəs/ US  /ˈpɔːr.əs/
describes something that has many small holes, so liquid or air can pass through, especially slowly: porous soil with good drainage porous brick walls a porous polymer membraneHoles, hollows and dips not protected enough to stop people going through: The border in this region is porous and many refugees have simply walked across.Weakness and vulnerability
(Definition of porous adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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