Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
grădātus, a, um, adj. [gradus], furnished with steps (post-Aug.): densis gradatisque corticum pollicibus ut orbibus, Plin. 13, 4, 7, § 29; Plin. Ep. 5, 6, 17.