Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
praepūtĭo, āre, v. a. [praeputium], to draw out the foreskin, Schol. Juv. 10, 206.
Hence, praepūtĭātus, a, um, P. a., having the foreskin, uncircumcised (eccl. Lat.), Tert. adv. Marc. 5, 9.