Irmos (pl. Irmi). See Canon.
Kathisma. A verse during the singing of which it is permitted to sit.
Omophorion. The bishop’s pall.
Orarion. The deacon’s stole.
Phelonion. A vestment or cope.
Prokimenon. A verse, taken from the psalms, sung before the reading of an appointed epistle. With this is conjoined another verse, and the mode of saying and singing these is as follows. The reader says the prokimenon, and the choir repeats the same. Then the reader says the conjoined verse, and the choir again sings the prokimenon. Finally the reader says half the prokimenon, and the choir sings the remaining half.
Sloujébnik. The service book containing the prayers said by the priest and deacon at Vespers, Matins, and Liturgy.
Stasis. A subdivision of the psalter. The whole psalter is divided into twenty sections, and each of these is subdivided into three parts.[3]
Sticharion. A tunicle.
Stichera. Ecclesiastically composed verses, usually conjoined with verses selected from the psalms.