doctorize

verb2

1. •
   (no longer used) To work as a doctor.

   • I still continued to doctorize with great eclat, till very lately I have been disabled by ill health. — 1803
2. •
   (no longer used) To treat medically, as a doctor.

   • "Enough, my friend," said I, "you have enough to doctorize the whole town of St. Louis. […]" — 1868