Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
quīnārĭus, a, um, adj. [quini], containing five (mostly post-Aug.): quinaria (fistula) dicta a diametro quinque quadrantum, a pipe which was five quarter-digits in diameter, Front. Aquaed. 25; so, fistulae, Plin. 31, 6, 31, § 58: quinarius nummus, and absol., quinarius, a half denarius: denarii quod denos aeris valebant: quinarii, quod quinos, Varr. L. L. 5, § 173 Müll.; Plin. 33, 3, 13, § 44: numerus, Serv. Verg. G. 1, 277; Macr. Somn. Scip. 1, 6.