polyandrion

Century Dictionary and Cyclopedia

1. n. In Greek antiquity and archaeology, a monument or a burial inclosure provided by the state for a number of men, usually for those of its citizens who had fallen in a battle. The famous “Lion of Chæronea” which stood within the burial inclosure of the Thebans who died in the battle with Philip of Macedon. 338 b. c., was a monument of this class; and this was itself a close copy throughout of that recently excavated at Thespiæ, which is believed to have commemorated the Thespians who fell at platæa, 479 b. c.

Wiktionary

1. n. A mass grave