petrol

Petrol is one of those words that feels plain and modern until you crack it open and find a Greek pebble and a dollop of oil inside. The ancient ingredients are πέτρα, “rock,” and ἔλαιον, “oil,” smashed together into πετρέλαιον — literally “rock oil” — long before anyone was pulling it out of a car pump. Medieval Latin kept the learned form petroleum, French shaved it down to pétrol in 1892, and English imported that neat little package in 1895. The surprise is that British motorists ended up saying petrol while Americans went with gas, even though both are talking about the same volatile stuff refined from crude oil. So every time someone in London asks for a petrol station, they’re really asking for a little bottled geology.