octoechos
noun
oc·to·echos
ˌäktōˈēˌkäs
plural -es
: a liturgical book of the Eastern Orthodox Church attributed to St. John of Damascus and containing all hymns to be used at offices throughout the whole week
Word History
Etymology
New Greek oktōēchos, oktaēchos, from Greek okta- octa- + ēchos sound
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