euthanasiate noun 1verb 1forms 3 noun1 •Any drug used to euthanize an animal.That chemical methods of euthanasia (such as injectable euthanasiates such as barbituates) far outweighed all other methods used to perform euthanasia of laboratory animals. — 1990 verb1 •To kill in a humane manner.The dog was euthanasiated 40 days after the MRI examination because its convulsions had worsened. — 2000 formseuthanasiated · euthanasiating · euthanasiates