κολυμβήθρα
From LSJ
ἵνα οὖν μηδ' ἐν τούτῳ δῷ αὐτοῖς λαβήν (Photius, Fragments on the Epistle to the Romans 483.26) → so that he doesn't give them even here a handle (= an opportunity for refutation)
English (LSJ)
ἡ,
A place for diving, swimming-bath, Pl.R.453d, D.S.11.25; κ. μύρου Alex.300. II wine-vat, tun, D.S.13.83. III reservoir, cistern, LXX 4 Ki.18.17. IV baptismal font, POxy.147 (vi A.D.).
