semipermeable


semi·per·me·able

adj
\ˌsem-i-ˈpər-mē-ə-bəl, ˌsem-ˌī-\

Definition of SEMIPERMEABLE

: partially but not freely or wholly permeable; specifically : permeable to some usually small molecules but not to other usually larger particles <a semipermeable membrane>
semi·per·me·abil·i·ty \-ˌpər-mē-ə-ˈbil-ət-ē\ noun, plural semi·per·me·abil·i·ties

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