Pronunciation: (pen"dē-kôs-tä'rē-ôn; Eng. pen"ti-ko-stâr'ē-on"), [key]
—pl. -cos•ta•ri•aPronunciation: (-kôs-tä'rē-ä; Eng. -ko-stâr'ē-u), [key] -cos•ta•ri•ons. Gk. Orth. Ch.
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.