Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
ob-longus, a, um, adj., rather long, longish; oblong (not in Cic. or Cæs.): missile telum hastili oblongo, Liv. 21, 8: figura, Plin. 37, 12, 75, § 196: folia, id. 25, 3, 6. § 21: scutula, Tac. Agr. 10.
Comp.: foramen oblongius, Vitr. 21, 8 fin.; 10, 11, 4.