/ ɪmˈpɜːmiəbl; NAmE -ˈpɜːrm-/ adjective
impermeable (to sth) ( technical ) not allowing a liquid or gas to pass through
OPP permeable
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WORD ORIGIN
late 17th cent.: from French imperméable , or from late Latin impermeabilis , from in- not + permeabilis (from permeare pass through, from per- through + meare pass, go).