noun, feminine/nɔs.tal.ʒi/plural: nostalgies
nostalgie is feminine in French.
nostalgia
Related: nostalgie de la boue
Borrowed from New Latin nostalgia, coined from Ancient Greek νόστος (nóstos, “a return home”) + ἄλγος (álgos, “pain, suffering”) as a calque of German Heimweh.