Meaning of “porous” in the English Dictionary

british dictionary

"porous" in British English

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uk /ˈpɔː.rəs/ us /ˈpɔːr.əs/

Something that is porous has many small holes, so liquid or air can pass through, especially slowly:

porous soil with good drainage
porous brick walls
a porous polymer membrane

not protected enough to stop people going through:

The border in this region is porous and many refugees have simply walked across.

(Definition of “porous” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"porous" in American English

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us /ˈpɔr·əs, ˈpoʊr·əs/

allowing liquid or air to pass through:

porous soil

(Definition of “porous” from the Cambridge Academic Content Dictionary © Cambridge University Press)