ῥυπτικός
From LSJ
Kατεσκευάσθη τὸ ἱερὸν τοῦτο ποτήριον ... ἐν ἔτει ,αω'α' → Τhis holy cup was made ... in the year 1801
English (LSJ)
ή, όν,
A fit for cleansing from dirt, ῥυπτικωτάτη κόνις Plu.2.697a; -κὴ δύναμις detergent, Gal.10.565: c. gen., ῥ. τοῦ φάρυγγος cleansing or clearing the throat, Arist.Pr.903b29, cf. Pl.Ti.65d, Thphr.CP6.1.3: but c. gen. objecti, ῥ. ξηρότητος fit for cleaning it off, Arist.Sens.443a1. 2 purgative, Id.Pr.873b1.