Floccinaucinihilipilification, the declaration of an item being useless, is the longest non-medical term in the English language.
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In 1700s, the deer skin was a common medium of exchange between the trading settlers and the native Red Indians in America. This is how a buck became a slang for a dollar.
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Hoover vacuum cleaners were so popular in the UK that many people now refer to vacuuming as hoovering.
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Stressed is Desserts spelled backwards.
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The P.S. at the end of a letter stands for Post Script.
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The word "impossible" dropped in use by 50% over the course of the 20th century
5
The technical term for a cat’s hairball is a “bezoar.”
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