semipermeable

Phonetic Respelling: [ sem-ee-pur-mee-uh-buhl, sem-ahy- ]

Definition:

adj. allowing passage of certain especially small molecules or ions but acting as a barrier to others

Sentence:

The larger molecules could not pass through the semipermeable membrane.

More example sentences:

The larger molecules could not pass through the semipermeable membrane.

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Osmotic pressure prevents inward flow of water across a semipermeable membrane.

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Synonyms:

partially permeable; somewhat penetrable; partly passable

Antonyms:

inpenetrable