euthanize

UK: /ˈjuːθəˌnaɪz/ US: (yo̅o̅′thə nīz′)

Inflections of 'euthanize' (v): (⇒ conjugate)

euthanizes

v 3rd person singular (US & UK)

euthanizing

v pres p (US & UK)

euthanized

v past (US & UK)

euthanized

v past p (US & UK)

WordReference Random House Unabridged Dictionary of American English © 2025

eu•tha•nize  (yo̅o̅′thə nīz′), v.t., -nized, -niz•ing. 

1. Medicine to subject to euthanasia:
   to euthanize injured animals.

Also, eu•than•a•tize  (yo̅o̅ than′ə tīz′); [esp. Brit.,] eu′tha•nise′, eu•than′a•tise′. 

• euthan(asia) + -ize 1960–65

Collins Concise English Dictionary © HarperCollins Publishers::

euthanize, euthanise / ˈjuːθəˌnaɪz/(Austral)euthanaze, euthanase / ˈjuːθəˌneɪz/ verb

1. (transitive) to kill (a person or animal) painlessly, esp to relieve suffering from an incurable illness

Also called: euthanatize, euthanatise Etymology: 20th Century: back formation from euthanasia