Added 10 October 2026 permeant adjective Categories: Describing WordsRare Words adjective ! Definition from Wiktionary (CC BY-SA). More about permeant at Wordnik → Where our words come from → Able to pass through or into a given semipermeable membrane or polymer. a permeant ion species noun A substance which is able to pass through or into a membrane or polymer. Related Words: permeativedistributivepervasivepermeatingpermeablepervioussemipermiablepermeabelizedperforablepermeabilizablepermeabilizatedpermeabilized Back to today's word