IPA: /ˌkɛməˈθɛrəpɪst/
KK: /kɛməˈθɛrəpɪst/
A person who gives chemotherapy treatment to patients, usually to help fight cancer.
The chemotherapist explained the treatment plan to the patient.
Chemotherapist → It is formed from "chemo-" (from Greek "chēmeia", meaning chemistry) and "therapist" (from Greek "therapeia", meaning treatment). The word refers to a specialist who uses chemical substances to treat diseases, particularly cancer.
Think of 'chemistry' ('chemo-') being used for 'treatment' ('therapist') — that's why a chemotherapist is someone who treats with chemicals.