The Collaborative International Dictionary
pentecostys
Pentecosty \Pen`te*cos"ty\, n.; pl. Pentecosties. [Gr. ?, fr.
? the fiftieth, ? fifty.] (Gr. Antiq.)
A troop of fifty soldiers in the Spartan army; -- called also
pentecostys.
--Jowett (Thucyd. ).