Wiktionary
n. 1 (context science fiction English) The genocide of an entire alien species. 2 (context US colloquial English) The intentional killing of an entire foreign (plant or animal) species.
Wikipedia
Xenocide (1991) is the third novel in the Ender's Game series of books by Orson Scott Card. It was nominated for both the Hugo and Locus Awards for Best Novel in 1992. The title is a combination of 'xeno-', meaning alien, and '-cide', referring to the act of killing; altogether referring to the act of selectively killing populations of aliens, a play on genocide.
Usage examples of "xenocide".
By the time the name was changed to the War of Xenocide, humanity was no longer grateful, and the last thing any government would have dared to do was authorize a pension trust fund for Ender Wiggin, the perpetrator of the most awful crime in human history.
It was this very book that changed him from the child-hero to the child-monster, from the victor in the Third Bugger War to the Xenocide who destroyed another species quite unnecessarily.
How he found out Wiggin was the original Ender the Xenocide, but then his computer was ransacked and the files disappeared.
Not thirty million years in the future, as with my Homecoming books, or even three thousand years in the future, as with the trilogy of Speaker for the Dead, Xenocide, and Children of the Mind, but rather only a couple of centuries in the future, after nearly a century of international stasis caused by the Formic War.
This starship is to be used for the immediate transport of xenologers Marcos Vladimir "Miro" Ribeira von Hesse and Ouanda Qhenhatta Figueira Mucumbi to the nearest world, Trondheim, where they will be tried under Congressional Indictment by Attainder on charges of treason, malfeasance, corruption, falsification, fraud, and xenocide, under the appropriate statutes in Starways Code and Congressional Orders.
As the story of Han Qing-jao took over Xenocide and caused it to become two books, so also the story of Petra took over this, Bean's second book, and caused there to be a third, Shadow of Death (which I may extend to the longer phrase from the Twenty-third Psalm, The Valley of the Shadow of Death.
The age that began with one xenocide attempted had now ended with other xenocides prevented or, at least, postponed.