triodion

noun

tri·​odion

trēˈȯt͟hyȯn

plural triodia

-yȧ

: a liturgical book of the Eastern church containing the offices from the fourth Sunday before Lent to Easter including canons having usually only three odes instead of the regular nine

Word History

Etymology

Middle Greek triōidion, from Greek tri- three + ōidē ode

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