Definition of euthanasia noun from the Oxford Advanced Learner's Dictionary

 

euthanasia

 noun
noun
BrE BrE//ˌjuːθəˈneɪziə//
 
; NAmE NAmE//ˌjuːθəˈneɪʒə//
 
[uncountable]
 
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the practice (illegal in most countries) of killing without pain a person who is suffering from a disease that cannot be cured synonym mercy killing They argued in favour of legalizing voluntary euthanasia (= people being able to ask for euthanasia themselves). Word Origin early 17th cent. (in the sense ‘easy death’): from Greek, from eu ‘well’ + thanatos ‘death’.
See the Oxford Advanced American Dictionary entry: euthanasia