Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
† pā̆trisso (patrīzo), āre, v. n., = πατρίζω, to take after one’s father (ante-class.): tene id mirari, si patrissat finus? Plaut. Ps. 1, 5, 27; Ter. Ad. 4, 2, 25.