requiescat

noun

re·​qui·​es·​cat ˌre-kwē-ˈe-ˌskät 

-ˌkat;

ˌrā-kwē-ˈe-ˌskät

: a prayer for the repose of a dead person

Word History

Etymology

Latin, may he (or she) rest, from requiescere to rest, from re- + quiescere to be quiet, from quies

First Known Use

1772, in the meaning defined above