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[sem-ee-pur-mee-uh-buh l, sem-ahy-] /ˌsɛm iˈpɜr mi ə bəl, ˌsɛm aɪ-/
permeable only to certain small molecules:
a semipermeable membrane.
(esp of a cell membrane) selectively permeable

semipermeable sem·i·per·me·a·ble (sěm’ē-pûr’mē-ə-bəl, sěm’ī-)

Partially permeable.

Allowing passage of certain, especially small, molecules or ions but acting as a barrier to others. Used of biological and synthetic membranes.


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