noun, masculine

poste-frontière

/pɔs.t(ə).fʁɔ̃.tjɛʁ/

noun, masculine/pɔs.t(ə).fʁɔ̃.tjɛʁ/plural: poste-frontières

poste-frontière is masculine in French.

borderpost (installation, situated on a border, that deals with customs, immigration, etc.)