Definitions from Wiktionary ( )

▸ noun:  A physician; a member of the medical profession; one who is trained and licensed to heal the sick or injured. The final examination and qualification may award a doctor degree in which case the post-nominal letters are D.O., DPM, M.D., DMD, DDS, in the US or MBBS in the UK.
▸ noun:  A person who has attained a doctorate, such as a Ph.D. or Th.D. or one of many other terminal degrees conferred by a college or university.
▸ noun:  A veterinarian; a medical practitioner who treats non-human animals.
▸ noun:  A nickname for a person who has special knowledge or talents to manipulate or arrange transactions.
▸ noun:  (obsolete) A teacher; one skilled in a profession or a branch of knowledge; a learned man.
▸ noun:  (dated) Any mechanical contrivance intended to remedy a difficulty or serve some purpose in an exigency.
▸ noun:  A fish, the friar skate.
▸ noun:  (obsolete, nautical, slang) A ship's cook.
▸ verb:  (transitive) To act as a medical doctor to.
▸ verb:  (intransitive, humorous) To act as a medical doctor.
▸ verb:  (transitive) To make (someone) into an (academic) doctor; to confer a doctorate upon.
▸ verb:  (transitive) To physically alter (medically or surgically) a living being in order to change growth or behavior.
▸ verb:  (transitive) To genetically alter an extant species.
▸ verb:  (transitive) To alter or make obscure, as with the intention to deceive, especially a document.
▸ verb:  (transitive) To adulterate, drug, or poison (drink).
▸ verb:  (intransitive, obsolete) To take medicine.
▸ noun:  The title of an academic or medical doctor (a person who holds a doctorate); used before or instead of the doctor's name.

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