from The Century Dictionary and Cyclopedia
- n. In the hymnology of the Greek Church, the first strophe or stanza of a standard or original ode in a canon of odes, serving as a rhythmical and musical model for the other stanzas (troparia), both of its own ode and of others in the same rhythm.
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A strophe or stanza of a standard hymn which indicates the melody of a composition, is known as a hirmos (eirmos).
Some believe that a hirmos placed at the end of a hymn should be called a catabasia (katabasia) while others hold that the catabasia is a short hymn sung by the choir, who descend from their seats into the church for the purpose.
The troparia turn to the strophes of the hirmos as to a model.
-- Unlike the troparion, which follows the model set by the hirmos, the idiomelon has no model.
-- Troparia are the stanzas which follow the hirmos.