impermeable Meaning, Definition & Usage

  1. adjective preventing especially liquids to pass or diffuse through
    • impermeable stone
    • an impermeable layer of scum
    • a coat impermeable to rain

WordNet

Im*per"me*a*ble adjective
Etymology
Pref. im- not + permeable: cf. F. imperméable, L. impermeabilis.
Definitions
  1. Not permeable; not permitting passage, as of a fluid. through its substance; impervious; impenetrable; as, India rubber is impermeable to water and to air. -- Im*per"me*a*ble*ness, n. -- Im*per"me*a*bly, adv.

Webster 1913