The story
Named from the Orléans branch of the House of Bourbon (descended from the youngest son of Louis XIII), who were its leaders, + -ism.
Etymology from Wiktionary, CC BY-SA 4.0.
Orléanist
Today it means: A member of a French right-wing (except for 1814–1830) faction that arose out of the French Revolution, as opposed to the legitimists. Full definition →