A furor is a strong and sudden reaction, often negative and shared by many people, such as the furor that erupted when Coca-Cola replaced its beloved soft drink with "New Coke" in the 1980s.
Like the Latin word furia, which means "passion," a furor involves strong emotion. Not all furors are negative — sometimes a furor is just a fad or a craze that seems to come out of nowhere, like the rubber bracelets every kid in school seemed to start wearing at the exact same second. That bracelet furor? It all started with kids getting excited and saying they just had to have them.