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Meaning of semipermeable

sem•i•per•me•a•ble

Pronunciation: (sem"ē-pûr'mē-u-bul, sem"ī-), [key]
— adj.
  1. permeable only to certain small molecules: a semipermeable membrane.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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