In politics, lustration refers to the purge of government officials once affiliated with the Communist system in Central and Eastern Europe. Various forms of lustration were employed in post-communist Europe.
A gastrectomy is a partial or total surgical removal of the stomach.
Aha! So a gastrectomy is a surgery that removes part (or all) of the stomach -- usually for stomach cancers -- and a gastrojejunostomy is a surgery that inserts a tube to feed medicines to the stomach -- usually for people with cancers too.