Abbott-Smith Manual Greek Lexicon
ἀγνόημα (G51)
1 † ἀγνόημα , -τός, τό ( ἀγνοέω ), [in LXX: Ge 43:12 ( מִשְׁגֶּה ), To 3:3 , Jth 5:20 , Si 23:2 51:19 , I Mac 13:39 *;] a sin of ignorance (so in π. ; v. MM, VGT , s.v.): He 9:7 .†
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain