The Collaborative International Dictionary
Pentecoster
Pentecoster \Pen`te*cos"ter\, n. [NL., fr. Gr. ?, fr. ? fifty.]
(Gr. Antiq.)
An officer in the Spartan army commanding fifty men.
--Mitford.
Wiktionary
pentecoster
n. (context historical Ancient Greece English) An officer in the Spartan army commanding fifty men.