Which of these words originated as a trademarked brand name but has since become a generic term in English dictionaries?

Many everyday words in our language began as trademarked brand names that became so popular they entered common speech as generic terms. This process, called 'genericide,' occurs when a brand name becomes the standard term for a product category, sometimes causing companies to lose their trademark protection. Test your knowledge about brand names that have shaped our linguistic landscape!

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Thermos (vacuum flask)
Kindle (e-reader)
Sharpie (marker)
Post-it (sticky note)