doctor

/ˈdɒktə/
noun
  1. 1

    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.

    If you still feel unwell tomorrow, see your doctor.

  2. 2

    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.

  3. 3

    A veterinarian; a medical practitioner who treats non-human animals.

  4. 4

    A nickname for a person who has special knowledge or talents to manipulate or arrange transactions.

  5. 5

    A teacher; one skilled in a profession or a branch of knowledge; a learned man.

  6. 6

    Any mechanical contrivance intended to remedy a difficulty or serve some purpose in an exigency.

    the doctor of a calico-printing machine, which is a knife to remove superfluous colouring matter

  7. 7

    A fish, the friar skate.

verb
  1. 1

    To act as a medical doctor to.

    Her children doctored her back to health.

  2. 2

    To act as a medical doctor.

  3. 3

    To make (someone) into an (academic) doctor; to confer a doctorate upon.

  4. 4

    To physically alter (medically or surgically) a living being in order to change growth or behavior.

    They doctored their apple trees by vigorous pruning, and now the dwarfed trees are easier to pick.

  5. 5

    To genetically alter an extant species.

    Mendel's discoveries showed how the evolution of a species may be doctored.

  6. 6

    To alter or make obscure, as with the intention to deceive, especially a document.

  7. 7

    To take medicine.

Source: https://en.wiktionary.org/wiki/doctor