Abbott-Smith Manual Greek Lexicon
κοπετός (G2870)
1 κοπετός , -οῦ, ὁ ( κόπτω , mid.), [in LXX chiefly for מִסְפֵּד ;] = cl. κομμός , a beating of the head and breast , lamentation : seq. ἐπί c. dat. pers., Ac 8:2 .†
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain