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Definition allowing fluids or gases to pass through

Note that a second sense of the word comes into play when the prefix "im" is added. Typically Impermeable means "not allowing fluids or gases to pass through", but it can also mean that someone or something is "not affected by negative things."  For example, "She is impermeable to pain," or "He is impermeable to her tears."
  • The contact lenses are gas-permeable, so the eye can breath.
  • The geologist identified the rock as permeable by water.
  • They are using permeable materials for paving to achieve a stormwater management system close to natural conditions.
  • A semi-permeable membrane works like a strainer. A strainer could be used to capture pasta and let water through. Different kinds of semi-permeable membranes can capture or permit pass-through of various substances at the molecular level.
  • On the surface he's impermeable, except a scar above his left brow tells the truth . . . he's human.
    Simone Elkeles  --  Perfect Chemistry
  • impermeable = not allowing fluids or gases to pass through
  • When drawing in diffuse light, give boundaries a permeable tonal hedge by using patches of cross-hatching.
  • The substance of the wall seemed as permeable and yielding as light.
    London, Jack  --  White Fang
  • Since everyone in this house was both perfect and impermeable, I could only assume that she'd bought most of these things with me in mind.
    Stephenie Meyer  --  Eclipse
  • They tie nkisis of leaves around their wrists and declare themselves impermeable to bullets, immune to death.
    Barbara Kingsolver  --  The Poisonwood Bible
  • In Burundi, social divisions had long been more complex and the barriers among them more permeable than in Rwanda.
    Tracy Kidder  --  Strength in What Remains
  • The camerlegno's tone was impermeable.
    Dan Brown  --  Angels & Demons
  • Some of the eggs are permeable to skin oils.
    Michael Crichton  --  Jurassic Park
  • The substance of the wall seemed as permeable and yielding as light.
    Jack London  --  White Fang
  • But it was hidden by a sheath as impermeable as Nicole's when they met and went together to a series of fittings.
    F. Scott Fitzgerald  --  Tender is the Night
  • Specially treated to make it impermeable to gas.
    Kenneth Oppel  --  Airborn
  • They are solid and impermeable.
    Jostein Gaarder  --  Sophie's World
  • He was lonely still, but it was only a mist, a weather front that passed through him when he was alone, a feeling of having turned too permeable.
    Gish Jen  --  Typical American
  • She was faultless, in her impermeable tight pink-and-white casing.
    Susanna Kaysen  --  Girl Interrupted
  • Most of my Arizona clothes were too permeable for Washington.
    Stephenie Meyer  --  Twilight
  • We do not yet see that virtue is Height, and that a man or a company of men, plastic and permeable to principles, by the law of nature must overpower and ride all cities, nations, kings, rich men, poets, who are not.
    Ralph Waldo Emerson  --  Selected Essays

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