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 (sĕm′ē-pûr′mē-ə-bəl, sĕm′ī-)
1. Partially permeable.
2. Allowing passage of certain, especially small, molecules or ions but acting as a barrier to others. Used of biological and synthetic membranes.

sem′i·per′me·a·bil′i·ty n.


(Biology) (esp of a cell membrane) selectively permeable
ˌsemiˌpermeaˈbility n


(ˌsɛm iˈpɜr mi ə bəl, ˌsɛm aɪ-)

permeable only to certain small molecules: a semipermeable membrane.
sem`i•per`me•a•bil′i•ty, n.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adj.1.semipermeable - (of a membrane) selectively permeable
permeable - allowing fluids or gases to pass or diffuse through; "permeable membranes"; "rock that is permeable by water"
References in periodicals archive ?
Fabrizio Radice, Sales Manager, Corapack, explained NatureFlex[TM] NVS was the ideal choice to flow wrap the fruit as it not only protects the product inside, due to its semipermeability to moisture, but also provides good machinability and printability, ensuring a nice pack appearance.
Together with the advantages of being inert, low cost, optical clarity, high flexibility, and semipermeability, it can provide high [[CO.
To destroy the semipermeability of the surface membrane, but not that of the sarcoplasmic reticulum (SR), fibres were treated with 50 [micro]g x [ml.