ποδόνιπτρον

τό
A. water for washing the feet in, mostly pl., Od. 19.504; π. ποδῶν ib.343: sg., π. ἐκχεῖν Ar. Fr. 306; dub. in Com.Adesp. 35 (cod. Et.Gen.):—later ποδόνιπτρον, Ph. 2.472, J. AJ 8.2.5, Iamb. Protr. 21.ιά.
Liddell, Scott & Jones
A Greek-English Lexicon, 1940
An open-access project