Eū'cho-lo'gi-on or Eū-chōl'o-gy, n.

n. [Gr. εὐχολόγιον, prayer-book, from εὐχή, prayer, vow, from εὔχεσθαι, to pray, and λέγειν, to say, speak; Fr. eucologie.] (Eccl.) A formulary of prayers; the Greek ritual, in which are prescribed the order of ceremonies, sacraments, and ordinances.