Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
captātōrĭus, a, um, adj. [captator]; in the Lat. of the jurists, of or pertaining to legacy-hunters: institutiones, the establishing of a person as one’s heir on condition of being also made heir by him, Dig. 28, 5, 70; 28, 5, 69: scripturae, ib. 28, 30, 63.