patency

noun ! Definition from Wiktionary (CC BY-SA). Pronunciation from Wiktionary, via Kaikki.org. More about patency at Wordnik → Where our words come from →

1. The condition or state of being patent.
2. 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.
3. Obviousness; clarity.