What does euthanatise mean?
Euthanatise is a formal verb meaning to bring about a painless death for a person or animal, most commonly because they are suffering from a painful or incurable condition. It derives from the Greek "euthanasia," combining "eu" (good) and "thanatos" (death), so at root it describes a good or gentle death. In modern usage it applies most often to animals — a vet may euthanatise a beloved pet whose health can no longer be maintained — while its use regarding humans sits at the centre of ongoing legal and ethical debates over assisted dying. The word has a deliberately clinical tone that distances the speaker from the act, which is why informal English prefers softer expressions such as "put down" or "put to sleep." British English spells it "euthanatise," while American English typically writes "euthanize." Because it touches on mercy, mortality, and moral choice, it remains one of the most consequential verbs in medical ethics.
verbTo kill a human being or animal painlessly, typically because they are suffering from an incurable or painful condition; more broadly, to put an animal to death humanely.
- To induce a painless death in a person or animal suffering from an incurable condition, usually for reasons of mercy.
- To put an animal to death humanely, especially by veterinary means.
"The vet gently euthanatised the ageing dog after its quality of life had declined beyond recovery."
"Parliament debated whether doctors should be permitted to euthanatise terminally ill patients who request it."
"The wildlife rescue team made the difficult decision to euthanatise the injured deer rather than let it suffer."
Behind this clinical-sounding verb lie two tiny Greek words — "good" and "death" — making it literally a term for a good death.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of euthanatise
Euthanatise comes from the Greek noun "euthanasia," formed from "eu" meaning good or well and "thanatos" meaning death — hence "a good death." The term entered English scholarly and medical vocabulary around the early 17th century before yielding the verb form. It shares the Greek root "thanatos" with words like "thanatology" (the study of death) and shares the prefix "eu-" with words such as "euphoria" and "euphemism." The spelling "euthanize" is the standard American variant of the same verb.
Related word forms
How euthanatise is actually used
"Euthanatise" carries a formal, clinical register and appears chiefly in medical, legal, and ethical writing; everyday speech favours gentler phrasings like "put down" or "put to sleep." The topic is ethically charged when applied to humans, so the word is often used in debates about assisted dying. The spelling "euthanize" predominates in American English.
Easily confused with euthanatise
"Euthanize" is simply the American spelling of the same verb, while "euthanatise" is the British spelling; the meanings are identical.