LATIN DICTIONARYLexicon Latīnum
numeral

octōdecim

octōdecim (indeclinable)
Classical[ɔkˈtoː.dɛ.kĩː]Ecclesiastical[okˈtɔː.de.t͡ʃim]

Meaning

  1. indeclinablerareeighteen; 18
    1543, Petrus Comestor, Historia Scholastica, III Kings, "De porticu" Quarum talis erat compositio: Stylus, vel stipes columnae octodecim habebat cubitos altitudinis
    Si corpus Alucretur partes novem vel decem vel undecim vel duodecim, adeoque progrediatur post concursum cum partibus quindecim vel sexdecim vel septendecim vel octodecim.1687, Isaac Newton, “Axiomata, sive Leges Motus”, in Philosophiae Naturalis Principia Mathematica:

octōdĕcim,
I. 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.

Origins

From octō (“eight”) + decem (“ten”).

In English words that came into English from octōdecim

  • octodecillionoctōdecim

Quick answers

What does octōdecim mean in Latin?
octōdecim, a numeral, means “eighteen; 18”.
How do you pronounce octōdecim?
In classical Latin, [ɔkˈtoː.dɛ.kĩː]; in ecclesiastical (church) Latin, [okˈtɔː.de.t͡ʃim].