lethalize--prophetes.ai

lethalize, v. rare.
  (ˈliːθəlaɪz)
  [f. lethal a. + -ize.]
  trans. To destroy in a lethal chamber.

1897 Daily Tel. 5 Feb. 7/4 If the proprietress consented to have the animal lethalised, as it was unfit for work.

Oxford English Dictionary