( a. )
Not permeable; not permitting passage, as of a fluid. through its substance; impervious; impenetrable; as, India rubber is impermeable to water and to air.
( a. )
Not permeable; not permitting passage, as of a fluid. through its substance; impervious; impenetrable; as, India rubber is impermeable to water and to air.
Webster's Revised Unabridged English Dictionary. Пересмотренный полный словарь английского языка Webster. 2012