n A physician; a member of the medicine|medical profession; one who is trained and licensed to heal the sick. The final examination and qualification may award a doctorate in which case the post-nominal letters are DO, DPM, MD, DMD, DDS, DPT, DC, in the US or MBBS in the UK.
n A veterinarian; a member of the medicine|medical profession; one who is trained and licensed to heal the sick.
n (non-gloss definition|A nickname for) a person who has special knowledge or talents to manipulate or arrange transactions.
v (transitive) To act as a medical doctor to.
v (transitive) To make (someone) into an (academic) doctor.
v (transitive) To physically alter (medically or surgically) a living being in order to change growth or behavior.
v (transitive) To genetically alter an extant species.
v (transitive) To alter or make obscure, as with the intention to deceive, especially a document.