Abbott-Smith Manual Greek Lexicon
τέταρτος (G5067)
10 τέταρτος , -η, -ον [in LXX chiefly for רְבִיעִי ;] fourth : Mt 14:25 , Mk 6:48 , Ac 10:30 , Re 4:7 6:7 , 8 8:12 16:8 21:19 .†
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain