noun, masculine/bɑ̃.vɛ̃/plural: banvins
the monopoly held by a feudal lord on sales of wine in their jurisdiction during a particular period of time; a proclamation indicating the day on which such a monopoly ends
“De la sorte, le banvin empêchait le débit de vins de qualité inférieure et servait l'intérêt général.” — In this way, the banvin prevented the output of poor-quality wines and served the general interest.
From ban + vin (“wine”), related to Medieval Latin bannus (“jurisdiction”).