/pen'dee kaws tah"rddee awn/ ; Eng. /pen'ti ko stair"ee on'/ , n. , pl. pentecostaria /-kaws tah"rddee ah/ ; Eng. /-ko stair"ee euh/ , pentecostarions . Gk. Orth. Ch.
a service book of offices for the period from Easter to the Sunday after Pentecost.
[ pentekostárion, equiv. to Gk pentekost ( é ) PENTECOST + -arion -arium -ARY ]