A doctor is someone who is qualified in medicine and treats people who are ill.

A dentist or veterinarian can also be called doctor .

The doctor's is used to refer to the surgery or office where a doctor works.

A doctor is someone who has been awarded the highest academic or honorary degree by a university.

If someone doctors something, they change it in order to deceive people.

If someone doctors food or drink, they add a poison or drug to it.