{ ||Eu`cho*lo"gi*on (?), Eu*chol"o*gy (?), } n. [NL. euchologion, Gr. &?; prayer book; &?; prayer, vow (fr. &?; to pray) + &?; to say, speak.] (Eccl.) A formulary of prayers; the book of offices in the Greek Church, containing the liturgy, sacraments, and forms of prayers.