patency

nouns

the openness (lack of obstruction) of a bodily passage or duct
patency
is derived from
patent
is a type of (narrower)
without obstructions to passage or view
"the openness of the prairies"
openness
the property of being easy to see and understand
noticeability, noticeableness, obviousness, patency
is derived from
patent
is derived from
patent