ἀπόχυμα
From LSJ
αὐτὸν κέκρουκας τὸν βατῆρα τοῦ λόγου → you have struck the very threshold of the argument, you have struck the most important and chiefmost point
English (LSJ)
ατος, τό, (χέω)
A that which is poured out, Ti.Locr.100a, PFay.95.25(ii A. D.). 2 = ζώπισσα, Dsc.1.72. 3 Ὀρειβασίου ἀ., name of a kind of plaster, Aët.15.24.