auctoris
auctoris is a Latin form of auctor, meaning “author, originator; adviser”. It is the genitive singular masculine noun.
Found 38 times in the Latin texts on Socratos.
Where it is used
Cicero, De Natura Deorum 1.11: … m relictarumque rerum patrocinium suscepimus; non enim hominum interitu sententiae quoque occidunt, sed lucem auctoris fortasse desiderant. ut haec in philosophia ratio contra omnia disserendi nullamque rem aperte iudicandi prof …
Ovid, Heroides 11.8: Auctorisque oculis exigeretur opus!
All forms of auctor (declension table)
Source: Socratos (socratos.org), a free reader for Ancient Greek and Latin. Grammar from the Perseus Treebank and Morpheus; dictionary entries from Lewis & Short, A Latin Dictionary (Perseus Digital Library, CC BY-SA). Counts are from the texts on Socratos.