Definition of impermeable adjective from the Oxford Advanced Learner's Dictionary



BrE BrE//ɪmˈpɜːmiəbl//
; NAmE NAmE//ɪmˈpɜːrmiəbl//
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impermeable (to something) (specialist) not allowing a liquid or gas to pass through impermeable rock opposite permeable The insulating material should be impermeable to water vapour. Word Originlate 17th cent.: from French imperméable, or from late Latin impermeabilis, from in- ‘not’ + permeabilis (from permeare ‘pass through’, from per- ‘through’ + meare ‘pass, go’).
See the Oxford Advanced American Dictionary entry: impermeable