Usage: 2 forms in 14 verses
Form Translated As     In Verse(s)
τριακοστώ thirtieth LXX.1Kgs.16.23LXX.1Kgs.16.29LXX.2Kgs.13.10LXX.2Kgs.15.8LXX.2Kgs.15.13LXX.2Kgs.15.17LXX.2Kgs.25.27LXX.2Chr.16.1LXX.2Chr.16.12LXX.Neh.13.6LXX.Jer.52.31LXX.Ezek.1.1
τριακοστού thirtieth LXX.2Chr.15.19LXX.Neh.5.14

Liddell-Scott-Jones

τριακοστός (triakostos) thirtieth G:A

τριακοστός,

Ionic dialect τρῐηκ-, , όν, thirtieth, [Refs 5th c.BC+]; Aeolic dialect τρῐάκοιστος [] [Refs]

__II τ. duty of one-thirtieth, [Refs 4th c.BC+]