oc·to·echos | \ˌäktōˈēˌkäs\
plural -es

Definition of octoechos 

: 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

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History and Etymology for octoechos

New Greek oktōēchos, oktaēchos, from Greek okta- octa- + ēchos sound

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