Dr. – definition of Dr. by The Free Dictionary

1. Dr. – a person who holds Ph.D. degree (or the equivalent) from an academic institution; “she is a doctor of philosophy in physics”. doctor. bookman, scholar, scholarly person, student – a learned person (especially in the humanities); someone who by long study has gained mastery in one or more disciplines. 2.

https://www.thefreedictionary.com/Dr.