from The American Heritage® Dictionary of the English Language, 4th Edition
- transitive v. To subject to euthanasia.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- v. To submit (a person or animal) to euthanasia.
euthan(asia) + -ize.(American Heritage® Dictionary of the English Language, Fourth Edition)
Back-formation from euthanasia. 1970s. (Wiktionary)