χαλκεῖον
From LSJ
Φερσεφόνας κυάνεος θάλαμος → dark chamber of Persephone
English (LSJ)
Ion. χαλκ-ήϊον, τό, = foreg. 11, Hdt.1.68, Hp.Art.47,77, And.1.40, Pl.Euthd. 300b. II = χαλκίον (q.v.): 1 cauldron, pot, Hdt.4.81, 152 (v.l. χαλκίον), Hp.Morb.4.39, Pl.Prt.329a codd.: esp. copper in baths, Thphr.Char.9.8; χ. ἐρυθρόν vessel of pure copper, Hp.Ulc.12; χ. μολυβοῦν POxy.1648.62 (ii A. D.). 2 concave metal reflector in a lamp, X.Smp.7.4. 3 bronze structure, Paus.2.22.2. III τὰ χαλκεῖα (sc. ἱερά), at Athens, a festival at the end of the month Pyanopsion, Phanod.22, Hyp.Fr.90, cf. Poll.7.105; title of play by Menander.