1A doctor; physician — a general term for someone who treats illness or injury. In everyday speech it is often referred to politely as 「お医者さん」.
子どもが熱を出したのでお医者さんに連れて行った。
My child had a fever, so I took them to the doctor.
町の医者は優しく説明してくれた。
The local doctor explained things kindly.
医者の診断で手術が必要だと言われた。
The doctor's diagnosis was that surgery was necessary.
将来は医者になって困っている人を助けたい。
In the future, I want to become a doctor and help people in need.