Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
quā̆drus, a, um, adj. [for quatrus, from quattuor], square (post-class.): quadrus terminus, Auct. Limit. p. 281 Goes.: cella, Pall. 1, 40: lapides, Vulg. Isa. 9, 10.