Definition of "Cloister" :

noun: a courtyard with covered walks (as in religious institutions)

noun: residence that is a place of religious seclusion (such as a monastery)

verb: seclude from the world in or as if in a cloister

"She cloistered herself in the office."

verb: surround with a cloister

"Cloister the garden."

verb: surround with a cloister, as of a garden