patency

== English == === Etymology === From patent + -cy. === Pronunciation === IPA(key): /ˈpeɪtənsi/ === Noun === patency (plural patencies) (medicine) The condition or state of being patent. Antonyms: impatency, imperforation, atresia, occlusion (medicine) The degree of openness (of a tube, such as a blood vessel or catheter); the relative absence of blockage or obstruction, and measured in percent. Antonym: obstruction (uncountable) Obviousness; clarity.