Dictionary

impermeable

adjective im·per·me·able \(ˌ)im-ˈpər-mē-ə-bəl\

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

Full Definition of IMPERMEABLE

:  not permitting passage (as of a fluid) through its substance; broadly :  impervious
im·per·me·abil·i·ty \-ˌpər-mē-ə-ˈbi-lə-tē\ noun

Examples of IMPERMEABLE

  1. an impermeable layer of rock
  2. a fabric impermeable to moisture

Origin of IMPERMEABLE

Late Latin impermeabilis, from Latin in- + Late Latin permeabilis permeable
First Known Use: 1697
Medical Dictionary

impermeable

adjective im·per·me·able \(ˈ)im-ˈpər-mē-ə-bəl\

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>
im·per·me·abil·i·ty \(ˌ)im-ˌpər-mē-ə-ˈbil-ət-ē\ noun, plural im·per·me·abil·i·ties

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