| euthanasia | (noun) the act of killing someone painlessly (especially someone suffering from an incurable illness) | Synonyms: mercy killing |
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| euthanatise | (verb) intentionally cause the painless death of a person or animal | Synonyms: euthanatize, euthanise, euthanize, mercy kill |
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| euthanatize | (verb) intentionally cause the painless death of a person or animal | Synonyms: euthanatise, euthanise, euthanize, mercy kill |
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| euthanise | (verb) intentionally cause the painless death of a person or animal | Synonyms: euthanatise, euthanatize, euthanize, mercy kill |
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| euthanize | (verb) intentionally cause the painless death of a person or animal | Synonyms: euthanatise, euthanatize, euthanise, mercy kill |
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| euthenics | (noun) the study of methods of improving human well-being and efficient functioning by improving environmental conditions | - |
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| eutherian | (adjective) of or relating to or belonging to the subclass Eutheria | - |
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| (noun) mammals having a placenta; all mammals except monotremes and marsupials | Synonyms: eutherian mammal, placental, placental mammal |