Quadruplex | Webster's Dictionary of the English Language

quadruplex
quā̆drŭplex, ĭcis, adj. [quattuor-plico]. I Fourfold , quadruple : pecunia, Plaut. Curc. 5, 2, 21...

A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.
quadruplex
quadruplex icis, adj.quattuor + PARC-, fourfold, quadruple : onerarium (navium) ordo, L.— Four : s...

An Elementary Latin Dictionary