semipermeable

The definition of semipermeable is capable of only having certain things get through it.

(adjective)

An example of semipermeable is a selectively permeable membrane.

See semipermeable in Webster's New World College Dictionary

adjective

allowing some substances to pass; permeable to smaller molecules but not to larger ones, as a membrane in osmosis

See semipermeable in American Heritage Dictionary 4

adjective

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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