煤油 (méi yóu) literally means 'coal oil' — 煤 (méi) refers to coal, and 油 (yóu) means oil. Though historically derived from coal tar, modern kerosene is actually a refined fraction of petroleum. In Chinese, the term remains standard for this clear, flammable liquid used primarily as fuel for lamps, stoves, heaters, and some small engines.

It’s commonly found in rural or off-grid settings where electricity is unreliable, and appears in contexts related to household energy, emergency preparedness, or traditional lighting. While less common in urban households today due to widespread electrification, 煤油 still holds cultural resonance — for example, in phrases like 煤油灯 (méi yóu dēng, kerosene lamp), evoking nostalgia or historical settings. It is not used for cooking oil or edible purposes; confusing it with 食用油 (shíyòng yóu) would be dangerous.