Abbott-Smith Manual Greek Lexicon
ἕβδομος (G1442)
9 ἕβδομος , -η, -ον ( ἑπτὰ ), [in LXX chiefly for שְׁבִיעִי ;] seventh : Jo 4:52 , He 4:4 (LXX), Ju 14 , Re 8:1 10:7 11:15 16:17 21:20 .†
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain