the immortals who inhabit Luggnagg, from Gulliver's Travels
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Uses:
One day, in much good company, I was asked by a person of quality, “whether I had seen any of their struldbrugs, or immortals?” I said, “I had not;” and desired he would explain to me “what he meant by such an appellation, applied to a mortal creature.”
Jonathan Swift. Gulliver's Travels Into Several Remote Regions of the World (1726)