long-lost Pronunciation: /ˈlɔːŋˈlɔːst; ˈlɒŋlɒst/Spanish translation of long-lostadj (before n) she had a long-lost uncle in Australia = tenía un tío en Australia a quien había perdido de vista hacía mucho tiempolong-lost in other Oxford dictionaries Definition of long-lost in the British & World English dictionary Definition of long-lost in the US English dictionary