From olethros; to spoil, i.e. Slay -- destroy.
see GREEK olethros
STRONGS NT 3645: ὀλοθρεύωὀλοθρεύω and, according to a preferable form, ὀλεθρεύω (Lachmann; see Bleek, Hebrew-Br. ii. 2, p. 809; cf. Delitzsch, Commentary on Hebrews, as below; (Tdf. Proleg., p. 81; WH's Appendix, p. 152)); (ὄλεθρος); an Alex. word (Winers Grammar, 92 (88)); to destroy: τινα, Hebrews 11:28. (Exodus 12:23; Joshua 3:10; Joshua 7:25; Jeremiah 2:30; Haggai 2:22, etc.; (Philo, alleg. 2:9).) (Compare: ἐξολοθρεύω.)