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permeable

From Wiktionary

Pronunciation

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Adjective

[change]

Positive
permeable

Comparative
more permeable

Superlative
most permeable

  1. A substance is permeable if it lets some gases or liquids to pass through it.
    Earthenware is a solid substance which is permeable to small amounts of water.
    Biological cell walls are semi-permeable because they let water and some gases pass through, but stop larger molecules.