κοπετόςkopetós, kop-et-os'; from G2875; mourning (properly, by beating the breast):—lamentation.
Thayer's Greek Lexicon
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STRONGS G2870:
κοπετός, κοπετοῦ, ὁ (from κόπτομαι, see κόπτω), the Sept. for מִסְפֵּד; Latinplanctus, i. e. lamentation with beating of the breast as n sign of grief: κοπετόνποιεῖσθαιἐπίτίνι, Acts 8:2; ἐπίτινα, Zechariah 12:10. (Eupolis in Bekker's annott. ad Etym. Magn., p. 776; Dionysius Halicarnassus, Antiquities 11, 31; Plutarch, Fab. 17.)