trīgintā
Georges, Ausführliches lateinisch-deutsches Handwörterbuch:
trīginta, Kardinalzahl, indeklinabel (τριάκοντα), dreißig
triginta minaePlaut.
triginta tyranniCic.
septem et triginta anniCic.
Charlton T. Lewis, An Elementary Latin Dictionary:
trīgintā or XXX, numeral indeclinable cf. τριάκοντα, thirty
minor triginta annis natusCic.
Triginta magnos orbīs explebitVerg.
cum HS XXX scripta essent pro HS CCCCic.
Text based on data provided by Perseus Digital Library, with funding from The National Endowment for the Humanities. Original version available for viewing and download at http://www.perseus.tufts.edu