euchologion

[ Greek ef-khaw-law-yee-awn; English yoo-kuh-loh-jee-on, -uh n ]
/ Greek ˌɛf xɔˈlɔ yi ɔn; English ˌyu kəˈloʊ dʒiˌɒn, -ən /

noun, plural eu·cho·lo·gi·a [Greek ef-khaw-law-yee-ah; English yoo-kuh-loh-jee-uh] /Greek ˌɛf xɔˈlɔ yi ɑ; English ˌyu kəˈloʊ dʒi ə/. Eastern Church.

a service book containing liturgies, prayers, and other rites.
Also euchology.

Origin of euchologion

1645–55; < ecclesiastical Greek euchológion prayer book, equivalent to euch(ḗ) prayer + -o- -o- + -log- word + -ion noun suffix