Etymology
From New Latin nostalgia, coined by Johannes Hofer in 1688 from Ancient Greek νόστος (nóstos, “returning home”) + ἄλγος (álgos, “pain”), calquing German Heimweh. Ancient Greek *νοσταλγία (*nostalgía) is unattested. Transferred sense probably influenced by French nostalgie, especially in literature.
Compare Italian nostalgia, Spanish nostalgia, Portuguese nostalgia and French nostalgie.