auctorn.

/ˈɔːktɔː/Etymology: < Latin auctor: see author n.
Roman Law.
society > trade and finance > selling > seller > [noun]
1875 E. Poste tr. Gaius (ed. 2) iii. 401 His auctor, or the person from whom he deduced his title.
This entry has not yet been fully updated (first published 1885; most recently modified version published online March 2018).