προσκεφάλαιον
From LSJ
διφθέραι σταδιαῖαι τοῖς μεγέθεσιν → hides a stade in size, hides fastened together so as to cover a place an entire stadium in extent
English (LSJ)
τό,
A cushion for the head, pillow, Hp.Fract.16, Ar.Pl. 542, Lys.12.18, etc.: generally, any cushion, Cratin.269, Hermipp. 54, Thphr.Char.2.11, PCair.Zen.92.22 (iii B.C.), LXX Ez.13.18, Ev.Marc.4.38, etc.: Dor. ποτικεφάλαιον IG5(1).1390.23 (Andania, i B.C.); also ποικεφ-, Schwyzer 323 C 30 (Delph.). II name for a treasure-chamber of the Persian kings, Chares 2 J.