Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
praesĭdātus (praesĭdĭātus), ūs, m. [praeses], the office of governor of a province, governorship (post-class.): Dalmatiae, Vop. Carin. 17: praesidatu regere, Aur. Vict. Caes. 29; Dig. 27, 1, 6.