*euchology*

{ ‖ } n. [ NL. euchologion, Gr. &unr_; prayer book; &unr_; prayer, vow (fr. &unr_; to pray) + &unr_; to say, speak. ] (Eccl.) A formulary of prayers; the book of offices in the Greek Church, containing the liturgy, sacraments, and forms of prayers. [ 1913 Webster ]