doctor

ot noun

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. 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
3. 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.
4. A veterinarian; a medical practitioner who treats non-human animals.

fe’l verb

1. To act as a medical doctor to. Her children doctored her back to health.
2. 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.
3. To genetically alter an extant species. Mendel's discoveries showed how the evolution of a species may be doctored.
4. To act as a medical doctor.