From doctor + -al, probably modelled on .

• (British) IPA: /ˈdɒktəɹəl/, /ˈdɒktɹəl/, /ˌdɒkˈtɔɹəl/

doctoral (not comparable)

1. Relating to a doctorate.
2. Pertaining to a medical doctor or physician.
   • 1603, Michel de Montaigne, chapter 13, in John Florio, transl., The Essayes […], book III, London: […] Val[entine] Simmes for Edward Blount […], →OCLC ↗:

     We have no need of doctorall consultations or collegian interpretations. Our senses tell us where it is and what it is.

• Italian: dottorale
• Russian: до́кторский