claustral
adjective
claus·tral ˈklȯ-strəl 
: cloistral
Example Sentences
Recent Examples on the Web What today is beach-front property was then a verdant, claustral jungle; in photographs the dinosaurs seem to be lurking just outside the frame. 
The Economist, 7 Nov. 2019
The Economist, 7 Nov. 2019 Word History
Etymology
Middle English, from Medieval Latin claustralis, from claustrum cloister, from Latin, bar, bolt, confining space, from claudere
First Known Use
15th century, in the meaning defined above