Definitions for "Heirmos"
the leading stanza of a kontakion (q.v.)
(pl. Heirmoi, Irmosi) a hymn that stands as the first troparion in each ode of a kanon and serves as a thematic link between the Scriptural canticles and the feast being celebrated. In the Greek originals, the h. established the melodic and metric model used in subsequent stanzas of each ode.