im·​per·​me·​able | \ (ˌ)im-ˈpər-mē-ə-bəl How to pronounce impermeable (audio) \

Definition of impermeable

: not permitting passage (as of a fluid) through its substance broadly : impervious

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Other Words from impermeable

impermeability \ (ˌ)im-​ˌpər-​mē-​ə-​ˈbi-​lə-​tē How to pronounce impermeable (audio) \ noun

Examples of impermeable in a Sentence

an impermeable layer of rock a fabric impermeable to moisture
Recent Examples on the Web Yet Pong remains curiously impermeable, more symbol than character. Alexandra Schwartz, The New Yorker, "Chang-rae Lee Lets Loose in “My Year Abroad”," 8 Feb. 2021 Some residents raised environmental concerns, including the impact on the Cuyahoga River and a potential increase in flooding due to the addition of impermeable surfaces. Robin Goist, cleveland, "Akron City Council postpones decision on upscale townhouses at former Riverwood Golf Course near Cuyahoga Valley National Park," 15 Dec. 2020 Then there’s social distancing, often facilitated by child-impermeable barrier. Washington Post, "Santa Claus is coming to town. Try not to infect him.," 9 Dec. 2020 The spots were evidence that the skin that was growing back was growing thicker, more impermeable with every passing week, as a heart is perhaps not. Bindu Bansinath, Bon Appétit, "After a Life-Changing Injury, I Had to Eat to Heal," 8 Dec. 2020 The Madison formation is capped by a thick layer of impermeable rock, so the CO₂ wouldn’t be able to escape. Bloomberg Wire, Dallas News, "Exxon Mobil shelves a carbon capture project using technology that could slow climate change," 8 Dec. 2020 On Wednesday, state officials issued a memo that says outdoor restaurants can have a canopy or other type of shelter from the sun, but no more than 50% of the outdoor dining area’s perimeter can be surrounded by impermeable walls. Los Angeles Times, "Coronavirus hospitalizations worsen in California, raising new alarms," 28 Nov. 2020 Since March, Portland firefighters also began wearing full face or half-face respirators or special impermeable hazmat-type suits for all medical calls when they could be exposed to someone with coronavirus. oregonlive, "Portland Fire Bureau records 8 positive COVID tests among firefighters in last week, 57 quarantined," 25 Nov. 2020 While the bubble isn’t impermeable, Mack said every team was asked to test for COVID-19 three times a week for two weeks prior to the event. Shannon Russell, The Courier-Journal, "The wait is over. Louisville basketball nears its season opener against Evansville," 24 Nov. 2020

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'impermeable.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of impermeable

1661, in the meaning defined above

History and Etymology for impermeable

Late Latin impermeabilis, from Latin in- + Late Latin permeabilis permeable

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Time Traveler for impermeable

Time Traveler

The first known use of impermeable was in 1661

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Statistics for impermeable

Last Updated

14 Feb 2021

Cite this Entry

“Impermeable.” Dictionary, Merriam-Webster, Accessed 26 Feb. 2021.

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More Definitions for impermeable



English Language Learners Definition of impermeable

technical : not allowing something (such as a liquid) to pass through


im·​per·​me·​able | \ (ˈ)im-ˈpər-mē-ə-bəl How to pronounce impermeable (audio) \

Medical Definition of impermeable

: not permitting passage (as of a fluid) through its substance the plasma membrane of a red blood cell is relatively impermeable to sodium and calcium ions

Other Words from impermeable

impermeability \ (ˌ)im-​ˌpər-​mē-​ə-​ˈbil-​ət-​ē How to pronounce impermeable (audio) \ noun, plural impermeabilities

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