σφαγία

From LSJ

τό γε μὴν ἀόργητον ἀνδρός ἐστι σοφοῦ → and to be able also to subdue anger is the part of a wise man

Source

German (Pape)

ἡ, der Opfertag, eigtl. fem. von σφάγιος, sc. ἡμέρα, Hesych.