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English definition of “semipermeable”

semipermeable

adjective     /ˌsem.iˈpɜː.mi.ə.bl̩/ US  /ˈpɜːr-/ specialized
describes something, for example a cell membrane, that allows some liquids and gases to pass through it, but not othersHoles, hollows and dips
(Definition of semipermeable adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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