tri rhomboidal (triromboidal)

[ sacraments are nece ary to salvation-name [ ly, baptism, the eucharist, and absolution. Trisagion (tri-sa'gi-on), n. thrice holy, found in almost all Eastern liturgies. In the West the Trisagion was used in the Gallican liturgy and in the Sarum prime. It is still sung in Greek Latin at the Reproaches on Good Friday. The anthem "Yet, O Lord God most holy," in the Anglican burial office, represents a form of the Trisagion. The name Trisagion is often in correctly applied to the Sanctus (Tersanctus).