βαλανικόν

From LSJ

αὐτὸν κέκρουκας τὸν βατῆρα τοῦ λόγου → you have struck the very threshold of the argument, you have struck the most important and chiefmost point

Source

Spanish (DGE)

-οῦ, τό
precio del baño Sch.Luc.Lex.2
tasa cobrada por el Estado para el mantenimiento de los baños públicos Ostr.390 (I d.C.), 862 (II d.C.), ἔχω ὑπὲρ βαλανικοῦ (δραχμὰς) β SB 4519.3 (I d.C.), cf. 9891.8 (III d.C.).