impermeable

Definitions

Agriculture

  • adjective referring to a substance which does not allow a liquid or gas to pass through
  • adjective referring to a membrane which allows a liquid to pass through, but not solid particles suspended in the liquid

Cars & Driving

  • adjective not capable of being permeated, especially by fluids

Construction

Medical

  • adjective not allowing liquids or gases to pass through
http://www.dictionarycentral.com/definition/impermeable.html