paternoster
noun
pa·ter·nos·ter ˌpä-tər-ˈnä-stər 
ˈpa-tər-ˌnä-stər;
ˈpä-ˌter-ˈnä-stər,
-ˈnä-ˌster 1
often capitalized : lord's prayer
2
: a word formula repeated as a prayer or magical charm
Word History
Etymology
Middle English, from Old English, from Medieval Latin, from Latin pater noster our father, from the opening words
First Known Use
before the 12th century, in the meaning defined at sense 1