kathisma
noun
ka·this·ma
variants or less commonly cathisma
ˈkȧthēzmə
plural kathismata
kȧˈthēzmətə
: one of the 20 sections into which the Psalter is divided for liturgical use in the Eastern Orthodox Church
Word History
Etymology
Middle Greek kathisma, from Greek, sinking, settling down, from kathizein to seat, sit down, from kata- cata- + hizein to seat; akin to Greek hezesthai to sit