impermeable

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impermeable

(of a substance) not allowing the passage of a fluid through interstices; not permeable
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

Impermeable

Resistance to penetration by fluids or vapor through the material.
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved

impermeable

[im′pər·mē·ə·bəl]
(science and technology)
Not permitting water or other fluid to pass through. Also known as impervious.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

impermeable

Said of a soil whose particles are so closely spaced that the passage of water is either prevented or very slow.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.