semipermeable Hear it!

semipermeable definition

semi·per·me·able (-pʉr′mē ə bəl)

adjective

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

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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