κομμός
κομμός (A), ὁ,(κόπτω)
A). striking; esp. beating of the head and breast in lamentation, ἔκοψα κομμὸν Ἄριον Ch. 423 (lyr.), cf. (pl.); hence, 1.97
2). in the Att. Drama, dirge, lament, sung alternately by one or more of the chief characters and the chorus, κ. δὲ θρῆνος κοινὸς χοροῦ καὶ ἀπὸ σκηνῆς Po. 1452b24 .