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Definition of impermeable adjective from the Oxford Advanced American Dictionary

 

impermeable

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