Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
quā̆drŭus, a, um, adj. [quattuor], fourcornered or fourfold (post-class.): errabam riguis per quadrua compita in hortis, i. e. laid out in squares, Aus. Idyll. 14, 5: vis, fourfold, Prud. Psych. 842.