Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
quā̆drŭplāris, e, adj. [quadruplus], fourfold, quadruple (post-class.): numerus duplaris, triplaris, quadruplaris (al. quadruplus), Macr. Somn. Scip. 1, 19, 21.