πλυντήριος

ον, τά
A. of or for washing: Πλυντήρια (sc. ἱερά), τά, a festival at Athens (on the 25th Thargelion), in which the clothes of Athena's statue were washed, IG 12.842, X. HG 1.4.12, Lycurg. Fr. 44, Plu. Alc. 34, Phot.s.v.καλλυντήρια.
Liddell, Scott & Jones
A Greek-English Lexicon, 1940
An open-access project