Semipermeable definition

sĕmē-pûrmē-ə-bəl, sĕmī-
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Allowing some substances to pass; permeable to smaller molecules but not to larger ones, as a membrane in osmosis.
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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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Allowing passage of certain, especially small, molecules or ions but acting as a barrier to others. Used of biological and synthetic membranes.
adjective
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The definition of semipermeable is capable of only having certain things get through it.

An example of semipermeable is a selectively permeable membrane.

adjective
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Permeable to some things and not to others, as a cell membrane which allows some molecules through but blocks others substances.
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Partially permeable.
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Partially permeable.
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