1A light fuel oil that is obtained by distilling petroleum and used in internal combustion engines; gasoline.‘cars had broken down or run out of petrol’
- ‘Eddie notices a stranger filling up his car with petrol’
- ‘petrol fumes’
2(also petrol blue)A shade of greenish or greyish blue.
Mid 16th century (in the sense ‘petroleum’): from French pétrole, from medieval Latin petroleum (see petroleum). The sense ‘fuel oil’ dates from the late 19th century, apparently reintroduced from French.