semipermeable
semi·per·me·able
adj \-ˈpər-mē-ə-bəl\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-ˈbi-lə-tē\ noun
See First Known Use of SEMIPERMEABLE
1888
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