What does carcinoma mean?
A carcinoma is a malignant tumour that originates in epithelial cells — the tissue forming the surface layer of the skin and the lining of internal organs and glands. Because most organs are lined with epithelium, carcinomas account for roughly 80 to 90 per cent of all human cancers, including common forms affecting the breast, lung, colon, prostate, and liver. The term belongs primarily to formal medical language: clinicians and pathologists use it precisely to distinguish these tumours from other major classes such as sarcomas, which arise from connective tissues. Carcinomas are often named after the organ or cell type they affect, as in basal cell carcinoma or hepatocellular carcinoma. The word carries a serious connotation, being firmly associated with cancer diagnosis and treatment, yet its precise meaning makes it invaluable in medicine, oncology reports, and health communication for general audiences.
nounA malignant tumour arising from epithelial cells, the tissue that lines internal organs and body surfaces. It is the most common broad category of cancer, encompassing types such as lung, breast, prostate, and colorectal cancer.
- A malignant tumour of epithelial origin, the most common class of human cancer.
- In pathology, any of the specific malignant epithelial neoplasms classified by cell type and organ (e.g., adenocarcinoma).
"The biopsy revealed an early-stage carcinoma in the lining of her stomach, which doctors were able to treat successfully."
"Screening programmes aim to detect colorectal carcinoma at an early, more curable stage."
"Under the microscope, the pathologist identified invasive ductal carcinoma in the breast tissue sample."
Both plurals are accepted in medical writing, but 'carcinomas' is overwhelmingly preferred in contemporary usage; 'carcinomata' reflects classical Greek pluralization and appears mainly in older texts or deliberately formal contexts.
"Pathologists distinguish several distinct carcinomas within a single biopsy specimen."
Hippocrates gave us the word 'carcinoma' over two thousand years ago — he thought the spreading veins around some tumours looked like the legs of a crab.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of carcinoma
Carcinoma derives from the ancient Greek word karkinos, meaning 'crab', combined with the suffix -ōma denoting a swelling or tumour; the crab reference is traditionally attributed to Hippocrates, who likened the radiating veins of certain tumours to crab's legs. The Latin form carcinos passed into medieval and early modern European usage, and English adopted the word around the 17th century. It shares this Greek root with 'carcinogen' and 'cancer' itself, since the Latin cancer also means 'crab'.
Related word forms
How carcinoma is actually used
Formal medical register; used chiefly by clinicians, pathologists, and health writers rather than in everyday conversation. Plural forms are both 'carcinomas' (anglicized) and 'carcinomata' (classical Greek-style), with 'carcinomas' far more common in modern medical literature. In lay contexts, people usually say 'cancer' or name the specific type instead of using the umbrella term.
Easily confused with carcinoma
Carcinoma arises from epithelial tissue, whereas sarcoma develops from connective or supporting tissues such as bone, cartilage, or muscle.
Melanoma is a cancer of melanocytes (pigment cells) and is not classified as a carcinoma, though it can occur in skin like carcinomas do.