ῥύμμα · rhymma — LSJ
anything used for washing, soap, lye
anything used for washing, soap, lye, Hp. Morb.Sacr. 1, Ar. Lys. 377, Pl. R. 429e sq.
II sediment, dirt remaining from washing
sediment, dirt remaining from washing, Gal. 6.795, Sch. Nic. Al. 95, Hsch.