Lewis & Short

quā̆drŭplex, ĭcis, adj. [quattuor-plico].

  1. I. Fourfold, quadruple: pecunia, Plaut. Curc. 5, 2, 21: ordo, Liv. 30, 10: quadruplici radice, Plin. 27, 8, 38, § 60.
  2. * II. Poet., in gen., four: stellae, Cic. Arat. 92.
  3. III. As subst.: quā̆drŭplex, ĭcis, n., a fourfold amount: gubernatoribus duplex, magistris quadruplex dedit, Liv. 45, 42, 1.