Speciecide, also known as "strategic extinctions" and "genocide", was the systematic genocide of an entire species.
In the Galactic Empire, in order to ensure interests in galactic security, the use of speciecide (or as they put it, orchestrating strategic extinctions) was condoned under extreme cases, and was even noted in the official field manual for the Imperial Military, the Imperial Handbook: A Commander's Guide. Crix Madine, a former Imperial soldier, added a footnote to the handbook regarding this section when it was leaked to the Rebel Alliance High Command confirming from personal experience that this claim was not an exaggeration.
While witnessing the Imperial invasion of Kashyyyk, former Jedi Olee Starstone realized it was not for the purpose of speciecide of the Wookiees, as the Imperials did not use orbital bombardment.
The Bothan concept of ar'krai required speciecide against their enemies. It was declared only three times in their history, the third being against the Yuuzhan Vong.
Use of speciecide on the Yuuzhan Vong species was discussed by the planning team of Star Wars: The New Jedi Order book series, including James Luceno. The idea was to wipe out the Vong on the Battle of Yuuzhan'tar. However, they ended up feeling that a merciful option would be more interesting and had the invaders sent into exile.
- Star Wars: Imperial Handbook: A Commander's Guide