refrigerium
/rɪfrɪˈdʒɪərɪəm/noun
A respite granted to the souls of the damned. In early use also: †a hymn or prayer requesting such a respite (obsolete ).
Origin
Mid 16th century; earliest use found in William Allen (1532–1594), cardinal. From classical Latin refrīgerium period of coolness, rest, relief, in post-classical Latin also refreshing, comfort, consolation (Vetus Latina), state of the blessed after death (late 2nd cent. in Tertullian), cooling from refrīgerare + -ium.