impermeable

[ im-pur-mee-uh-buh l ]
/ ɪmˈpɜr mi ə bəl /

adjective

not permeable; impassable.
Chemistry, Geology. (of porous substances, rocks, etc.) not permitting the passage of a fluid through the pores, interstices, etc.

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Origin of impermeable

From the Late Latin word impermeābilis, dating back to 1690–1700. See im-2, permeable

OTHER WORDS FROM impermeable

im·per·me·a·bil·i·ty, im·per·me·a·ble·ness, nounim·per·me·a·bly, adverb

WORDS THAT MAY BE CONFUSED WITH impermeable

impermeable impervious
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for impermeable

British Dictionary definitions for impermeable

impermeable
/ (ɪmˈpɜːmɪəbəl) /

adjective

(of a substance) not allowing the passage of a fluid through interstices; not permeable

Derived forms of impermeable

impermeability or impermeableness, nounimpermeably, adverb
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

Medical definitions for impermeable

impermeable
[ ĭm-pûrmē-ə-bəl ]

adj.

Impossible to permeate; not permitting passage.

Other words from impermeable

im•per′me•a•bili•ty null n.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Scientific definitions for impermeable

impermeable
[ ĭm-pûrmē-ə-bəl ]

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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.