From The Collaborative International Dictionary of English v.0.48 [gcide]: Cloister \Clois"ter\, v. t. [imp. & p. p. Cloistered; p. pr. & vb. n. Cloistering.] To confine in, or as in, a cloister; to seclude from the world; to immure. [1913 Webster] None among them are thought worthy to be styled religious persons but those that cloister themselves up in a monastery. --Sharp. [1913 Webster]