duodeviceni

duodēvīcēnī (feminine duodēvīcēnae, neuter duodēvīcēna); first/second-declension numeral, plural only

1. eighteen each
   • 59 BC–AD 17, Titus Livius, Ab Urbe Condita 21.41:

     Experiri iuvat utrum alios repente Carthaginienses per viginti annos terra ediderit, an idem sint qui ad Aegates pugnaverunt insulas et quos ab Eryce duodevicenis denariis aestimatos emisistis.

     I shall be glad to learn whether the earth has suddenly within the last twenty years produced a different breed of Carthaginans, or whether they are the same as those who fought at the Aegates, and whom you allowed to depart from Eryx on payment of eighteen denarii a head.

First/second-declension adjective, plural only.