impermeable

[im-pur-mee-uh-buhl]
adjective
1.
not permeable; impassable.
2.
Chemistry, Geology. (of porous substances, rocks, etc.) not permitting the passage of a fluid through the pores, interstices, etc.

Origin:
1690–1700; < Late Latin impermeābilis. See im-2, permeable

impermeability, impermeableness, noun
impermeably, adverb

impermeable, impervious.
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World English Dictionary
impermeable (ɪmˈpɜːmɪəbəl)
 
adj
(of a substance) not allowing the passage of a fluid through interstices; not permeable
 
impermea'bility
 
n
 
im'permeableness
 
n
 
im'permeably
 
adv

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Etymonline
Word Origin & History

impermeable
1697, from Fr. imperméable, from L.L. impermeabilis, from in- "not" + permeabilis (see permeable).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

impermeable im·per·me·a·ble (ĭm-pûr'mē-ə-bəl)
adj.
Impossible to permeate; not permitting passage.


im·per'me·a·bil'i·ty or im·per'me·a·ble·ness n.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
impermeable   (ĭm-pûr'mē-ə-bəl)  Pronunciation Key 
Relating to a material through which substances, such as liquids or gases, cannot pass. Some substances, such as some types of contact lenses, are permeable to gas but impermeable to liquid.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The impermeable overboots are worn over the uniform combat boots.
The salt causes the clay to swell, making it impermeable to water.
What hindered truth was clothing, the impermeable element between the interior
  world and the exterior world.
But his aides said the administration never intended to erect an impermeable
  barrier between officials and lobbyists.
Synonyms
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