Definition of "cloyster"

At the banquet the king took his station, incog. in a little closet made out of the cloyster of St. Stephen's, on the right side of the hall.

1823, Giles Gossip, Coronation Anecdotes‎

Davy Ramsey, his Majesty's clock-maker, had been informed, that there was a great quantity of treasure buried in the cloyster of Westminster-Abbey; he acquaints Dean Williams therewith, who was also then Bishop of Lincoln; the Dean gave him liberty to search after it, with this proviso, that if any was discovered, his church should have a share of it.

1715, William Lilly, William Lilly's History of His Life and Times‎

After dinner (there coming this morning my aunt Hanes and her son from London, that is to live with my father) I rode to Huntingdon, where I met Mr. Philips, and there put my Bugden [Bugden, or Buckden, a village and parish in the St. Neots district of Huntingdonshire, four miles S.W. of Huntingdon.] matter in order against the Court, and so to Hinchingbroke, where Mr. Barnwell shewed me the condition of the house, which is yet very backward, and I fear will be very dark in the cloyster when it is done.

1661, Samuel Pepys, Diary of Samuel Pepys, September/October 1661‎