sac ‧ ris ‧ ty /ˈsækrəsti, ˈsækrɪsti/ BrE AmE noun ( plural sacristies ) [countable]
[ Date: 1400-1500 ; Language: Medieval Latin ; Origin: sacristia , from sacrista ; ⇨ ↑ sacristan ]
a small room in a church, where holy cups and plates are kept, and where priests put on their ceremonial clothes SYN vestry