Bailly
ἐξ·ολεθρεύω, c. ἐξολοθρεύω, SPT. Gen. 17, 14 ; Ex. 12, 15 et 19 ; Lev. 17, 4, etc. ; NT. Ap. 3, 23.
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LSJ
destroy utterly, LXX Ge. 17.14, al., Act. Ap. 3.23, v.l. in J. AJ 8.11.1. (The spelling -ολοθρ- in this group of words is freq. in later codd. and Pap., as PMasp. 2 iii 28 (vi AD).)
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)