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.

Nearby words

  1. imperious,
  2. imperishable,
  3. imperium,
  4. impermanence,
  5. impermanent,
  6. impermissible,
  7. impers.,
  8. imperscriptable,
  9. imperscriptible,
  10. impersonal

Origin of impermeable

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

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

Can be confusedimpermeable impervious

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples 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 Formsimpermeability 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

Word Origin and History for impermeable

impermeable

adj.

1690s, from French imperméable, from Late Latin impermeabilis, from assimilated form of in- "not, opposite of" (see in- (1)) + permeabilis (see permeable).

Online Etymology Dictionary, © 2010 Douglas Harper

Medicine definitions for impermeable

impermeable

[ ĭm-pûrmē-ə-bəl ]

adj.

Impossible to permeate; not permitting passage.
Related formsim•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.

Science 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.