American English

Definition of impermeable adjective from the Oxford Advanced American Dictionary

     

    impermeable

     adjective
    adjective
    NAmE//ɪmˈpərmiəbl//
     
    impermeable (to something) (technology)
     
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  1. 1not allowing a liquid or gas to pass through impermeable rock opposite permeable
  2. 2 The insulating material should be impermeable to water vapor.
See the Oxford Advanced Learner's Dictionary entry: impermeable