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Meaning of pentecostarion

pen•te•cos•ta•ri•on

Pronunciation: (pen"dē-kôs-tä'rē-ôn Eng. pen"ti-ko-stâr'ē-on"), [key]
— pl. -cos•ta•ri•a -cos•ta•ri•ons.
  1. a service book of offices for the period from Easter to the Sunday after Pentecost.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.