Longman Dictionary of Contemporary English homepage

euthanize

 verb
     
eu‧tha‧nize also eu‧tha‧nase British English [transitive]
to kill an animal in a painless way, usually because it is very sick or old [= put down]:
The decision to euthanase a pet is heartbreaking.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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