semi-permeability

semipermeable

[sem-ee-pur-mee-uh-buhl, sem-ahy-]
adjective
permeable only to certain small molecules: a semipermeable membrane.

Origin:
1895–1900; semi- + permeable

semipermeability, noun
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World English Dictionary
semipermeable (ˌsɛmɪˈpɜːmɪəbəl)
 
adj
(esp of a cell membrane) selectively permeable
 
semipermea'bility
 
n

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American Heritage
Medical Dictionary

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
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