professor

noun8

1. •
   a university teacher who has reached the most senior level

   • Professor is what you become after teaching for twenty to thirty years. — 2014
2. •
   The title for someone who holds the job of professor.
3. •
   (US, informal) A teacher or faculty member at a college or university regardless of formal rank.
4. •
   (informal, disapproving) A mock title for a person seen as pedantic or obsessive on a topic.

   • This is just what I wanted. I got professor environment pants over here, and I can't get my jetski started. How am I gonna get back? — 2022
5. •
   The puppeteer who performs a Punch and Judy show; a Punchman.
6. •
   (US, slang) A pianist in a saloon, brothel, etc.

   • You could hear […] pianos under the hands of whorehouse professors sounding like they came with keys between the keys. — 2006
7. •
   (no longer used) A practitioner, one who (publicly) practises or teaches an art or skill.
8. •
   (no longer used) One who professes something, such as a religious doctrine.

   • […] I alvvayes thought / It vvas both impious and vnnaturall, / That such immanity and bloody strife / Should reigne among Professors of one Faith. — 1591