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semipermeable

[sem-ee-pur-mee-uh-buh l, sem-ahy-] /ˌsɛm iˈpɜr mi ə bəl, ˌsɛm aɪ-/
adjective
1.
permeable only to certain small molecules:
a semipermeable membrane.
Origin
1895-1900
1895-1900; semi- + permeable
Related forms
semipermeability, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for semi-permeable

semipermeable

/ˌsɛmɪˈpɜːmɪəbəl/
adjective
1.
(esp of a cell membrane) selectively permeable
Derived Forms
semipermeability, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for semi-permeable
adj.

1873, from semi- + permeable. Translating German halbdurchlässig.

Online Etymology Dictionary, © 2010 Douglas Harper
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semi-permeable in Medicine

semipermeable sem·i·per·me·a·ble (sěm'ē-pûr'mē-ə-bəl, sěm'ī-)
adj.

  1. Partially permeable.

  2. Allowing passage of certain, especially small, molecules or ions but acting as a barrier to others. Used of biological and synthetic membranes.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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