octodecim
form analysis and translation based on Perseus (Version 2010):
octodecim NUM  eighteen
Helmut Schmid's TreeTagger with Latin data by Gabriele Brandolini: octodecim ADJ:NUM
Georges, Ausführliches lateinisch-deutsches Handwörterbuch, 8. Aufl. (1913)
octōdecim, Numer. (octo u. decem), achtzehn, Liv. 39, 5, 14. Frontin. strat. 2, 5, 37. Eutr. 1, 1. § 1 (Wagner decem et octo).
Lewis & Short, A latin dictionary (1879)
octodecim, octōdĕcim, card. num. adj. [octo-decem], eighteen (mostly post-class, for duodeviginti): tetrachma Attica centum octodecim milia, Liv. 39, 5, 14: cohortes, Front. Strat. 2, 5, 37; Eutr. 1, 1.
Gaffiot, Dictionnaire latin-français (2016, ex 1934), merci à G. Gréco, M. De Wilde, B. Maréchal, K. Ôkubo!
octodecim octōdĕcim, ind. (octo, decem), dix-huit : Liv. 39, 5, 14.
Дворецкий И.Х., Отличный латинско-русский словарь (1976)
octodecim octodecim num. card. восемнадцать L etc.