What does oncologist mean?
An oncologist is a doctor who specializes in cancer. The role includes diagnosing malignant tumors, interpreting test results, explaining diagnoses, and recommending or managing treatments such as chemotherapy, radiotherapy, immunotherapy, and surgery. Patients may meet an oncologist in a hospital, specialist clinic, or cancer center, usually after a referral or an urgent assessment. The term is most commonly associated with medical oncology, but it can also be modified to indicate a subspecialty, such as pediatric, surgical, or radiation oncology. Because cancer care is often complex and emotionally demanding, the word carries a serious clinical and sometimes somber connotation. It is distinct from a pathologist, who primarily examines tissues and specimens to establish diagnoses, and from a neurologist, who treats nervous-system disorders.
nounA medical doctor who specializes in the diagnosis, treatment, and management of cancer.
- A physician who specializes in the diagnosis, treatment, and management of cancer.
"The oncologist explained the treatment options and discussed the potential side effects with her patient."
"After the biopsy, her oncologist discussed the diagnosis and treatment plan with the family."
"The research team consulted an oncologist to review the results of a new cancer treatment."
The plural is used when referring to multiple cancer specialists.
"The oncologists reviewed the patient's scan results together."
The word oncologist literally joins the Greek roots for “mass” or “swelling” and “study,” reflecting the long history of physicians studying tumors and cancer.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does oncologist come from?
The word derives from oncology, formed from Greek onkos, meaning “mass” or “swelling,” and -logia, meaning “study” or “science.” The suffix -ist denotes a specialist, so an oncologist is a practitioner of the study and treatment of cancerous growths. The related English forms oncogenic, oncogenesis, and oncological developed from the same Greek root.
Related word forms
How oncologist is actually used
Oncologist is a formal medical term. Medical oncologist specifically refers to a physician who treats cancer, while surgical oncologist and radiation oncologist are more specialized forms.
Easily confused with oncologist
An oncologist specializes in cancer, whereas a neurologist specializes in disorders of the nervous system.
A pathologist studies disease in laboratory and tissue samples, while an oncologist diagnoses and treats cancer in patients.