Definition of "Brigadoon"

A mile walk took us into Mountshannon, a sort of Brigadoon, so quiet in the warm sun we thought it deserted.

1988 July, Cruise Travel, volume 10, number 1, page 46

But low tide allowed us to walk on tiptoes along an underwater sandbar, and explore the tide pools, miniature maritime Brigadoons in which we'd find crabs...

2003, George Howe Colt, The big house: a century in the life of an American summer home