Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
arcŭātim, adv. [arcuo], in the form of a bow (perh. only in the foll. exs.): millepeda animal multis pedibus arcuatim repens, Plin. 29, 6, 39, § 136: sanguis arcuatim fluens, Fest. s. v. Tullios, p. 352 Müll.