What does euthanise mean?
To euthanise someone or something is to end its life deliberately and painlessly, usually because it is suffering from an incurable illness or unbearable pain. The verb derives from the Greek roots 'eu' (good) and 'thanatos' (death), so at its core it means to bring about a 'good death.' In everyday use, euthanise appears most often in veterinary contexts: owners may euthanise a sick or ageing pet to spare it further distress. When applied to people, the word enters fraught ethical and legal territory, as assisted dying remains illegal in many countries while being regulated and permitted in others. The term carries a clinical, humane connotation, distinguishing it from words like 'kill' or 'slaughter,' which lack any implication of mercy. Writers should note the regional spelling difference — 'euthanise' in British English, 'euthanize' in American English — and treat the word with sensitivity given the profound moral questions surrounding its human application.
verbTo kill a person or animal painlessly, typically because they are suffering from an incurable or painful condition.
- To end the life of a person or animal painlessly and deliberately, usually to relieve incurable suffering.
"The veterinarian gently euthanised the elderly dog to spare it further suffering."
"After the tumour spread and the pain became unmanageable, the family made the difficult decision to euthanise their beloved cat."
"Several countries permit physicians to euthanise terminally ill patients who have explicitly requested it."
The word literally means 'good death' in Greek — one of the few English verbs whose etymology is, at its heart, an act of compassion.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of euthanise
Euthanise comes from the Greek 'euthanasia,' formed from 'eu' meaning 'good' or 'well' and 'thanatos' meaning 'death.' The noun 'euthanasia' entered English in the early 17th century, originally carrying the broader sense of a peaceful, easy death before narrowing toward deliberate mercy killing. The verb form developed later as a back-formation from the noun, becoming common in medical and veterinary language during the 20th century.
Related word forms
How euthanise is actually used
'Euthanise' (British spelling) is standard in UK, Australian, and Canadian usage; 'euthanize' is preferred in American English. The word carries a clinical, compassionate register and is generally reserved for contexts where the killing is intended to relieve suffering — using it for ordinary killing would sound odd or euphemistic. It is most commonly applied to animals by veterinarians; when applied to humans, it touches on highly sensitive legal and ethical debates that vary sharply between jurisdictions.
Easily confused with euthanise
'Euthanasia' is the noun referring to the practice or concept of mercy killing, whereas 'euthanise' is the verb describing the act itself.