What is the definition of Eads?

"Eads" is a rather peculiar term that originally referred to the steel used for railroad tracks, but nowadays, it's often used as a slang term for a very expensive or rare item - think like a diamond in a cavern. It's like calling a vintage bottle of wine a 'eads' if it's priceless!

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Here's a darkly comedic example sentence: "I found an eads of rare vinyl records at the flea market, but they were all just silent, except for the echo of my own laughter."