Wiktionary
a. (alternative spelling of long-lost English) (Something missing for a protracted length of time)
Wikipedia
Long Lost is a novel by American writer Harlan Coben. It is the ninth novel in his series of a crime solver and sports agent named Myron Bolitar.
Usage examples of "long lost".
Sisko watched on his screen as the long lost ship moved into dock on its own power after eight hundred years in space.
It brought back a long lost memory of a fifth-grade babysitter who had watched him after school while his mother worked.
The tiny, shrunken Sun, whose pale rays had long lost the power of bringing warmth.
They had been so long lost now that any hopes for them must be definitely abandoned.
THE next day there was a grand procession through the streets of the Emerald City, in honor of the long lost King of Oz.