porous C1 Topic:Describing Qualities US /ˈpɔɹəs/ UK /ˈpɔːɹəs/ See IPA manual Freq #40636 Meanings 1 adj allowing passage in and out Our unfenced and largely unpoliced border inevitably has been very porous. 2 adj able to absorb fluids The partly porous walls of our digestive system. Thesaurus Synonyms 1 adj · allowing passage in and out holey More breathablespongy ↔ Opposites impermeable Word family Derived forms aporousbiporouselectroporoushyperporousimporousmacroporousmesoporousmicroporousmonoporousmultiporousnanoporousnonporous Etymology From Old French poros, from Latin porus (“an opening”). By surface analysis, pore + -ous. *per- (fare) Proto-Indo-European View etymology graph -> Topics Describing Qualities Word Formation & Derivatives External links Cambridge Dictionary Wiktionary Google Images # porous **Type:** Word **Level:** C1 **Part of speech:** adj **IPA (US):** /ˈpɔɹəs/ **IPA (UK):** /ˈpɔːɹəs/ **Frequency rank:** 40636 ## Meanings 1. allowing passage in and out 2. able to absorb fluids ## Examples - Our unfenced and largely unpoliced border inevitably has been very porous. - The partly porous walls of our digestive system. ## Synonyms - holey - breathable - spongy ## Antonyms - impermeable ## Derived Forms - aporous - biporous - electroporous - hyperporous - imporous - macroporous - mesoporous - microporous - monoporous - multiporous - nanoporous - nonporous ## Roots and Affixes - Root: *per- (fare) ## Etymology From Old French poros, from Latin porus (“an opening”). By surface analysis, pore + -ous. ## Topics - Describing Qualities - Word Formation & Derivatives markdown