1. not permeable; impassable.
  2. Chemistry, Geology. (of porous substances, rocks, etc.) not permitting the passage of a fluid through the pores, interstices, etc.


  1. (of a substance) not allowing the passage of a fluid through interstices; not permeable

1690s, from French imperméable, from Late Latin impermeabilis, from assimilated form of in- “not, opposite of” (see in- (1)) + permeabilis (see permeable).


  1. Impossible to permeate; not permitting passage.

  1. Relating to a material through which substances, such as liquids or gases, cannot pass. Some substances, such as some types of contact lenses, are permeable to gas but impermeable to liquid.

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