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.

Origin of impermeable

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

Related forms

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

Can be confused

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

Examples from the Web for impermeability

British Dictionary definitions for impermeability

impermeable

/ (ɪmˈpɜːmɪəbəl) /

adjective

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

Derived Forms

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

Medicine definitions for impermeability

impermeable

[ ĭm-pûrmē-ə-bəl ]

adj.

Impossible to permeate; not permitting passage.

Related forms

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.

Science definitions for impermeability

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.