What does chemo mean?
Chemo is an informal shortening of chemotherapy, the use of powerful cytotoxic drugs to treat cancer by destroying rapidly dividing cells. The term is ubiquitous in everyday speech, patient support communities, and popular media, where its brevity makes difficult conversations slightly easier to hold. People commonly speak of going through chemo, starting a round of chemo, or finishing chemo sessions. Although informal in register, the word carries no stigma and is used affectionately and matter-of-factly by patients and clinicians alike; in formal medical literature, however, the complete term chemotherapy is preferred. Derived ultimately from Greek roots relating to chemistry and alchemy via the longer term's history, chemo reflects how English routinely compresses long clinical vocabulary into warm, manageable forms. Its near-universal recognition makes it an important word in modern discussions of health and illness.
nounAn informal shortening of 'chemotherapy', the treatment of disease, especially cancer, using cytotoxic drugs that destroy rapidly dividing cells.
- Informal short form of chemotherapy: treatment of cancer with cytotoxic drugs.
"She began chemo in March and finished her final round in September."
"After his diagnosis, he started chemo within the week."
"The chemo left her exhausted, but the tumour had shrunk noticeably."
Rarely pluralized; when used, it typically refers to multiple individual chemo sessions rather than different kinds of treatment.
"She has several chemos scheduled over the next two months."
'Chemo' packs a life-changing medical ordeal into just two syllables — a word so widely understood that patients say it before doctors even finish saying 'chemotherapy'.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of chemo
Chemo arose in the twentieth century as a clipped form of 'chemotherapy', itself built from 'chemo-' (from Greek khēmeia or khīmeia, meaning the art of transmutation, the root of 'chemistry' and 'alchemy') combined with '-therapy', from Greek therapeia meaning healing or attendance. The clipping follows a familiar English pattern of abbreviating long medical terms into colloquial forms. Cognates sharing the same Greek root include chemistry, chemical, chemist, and alchemy.
How chemo is actually used
Register is informal but respectful; it is common in everyday conversation, patient communities, and journalism. In formal medical writing, the full term 'chemotherapy' is preferred.
Easily confused with chemo
A cameo is a small distinctive role or carved gem, while chemo refers to drug-based cancer treatment; the two share only a similar rhythm of syllables.