Translation guide
A type of low-rank coal, often called lignite. In Japanese, it is most commonly referred to as 褐炭 (かったん), but related terms exist for specific contexts.
The standard term for brown coal as a type of coal.
The most common and direct translation for 'brown coal' or 'lignite'. Used in geology, energy, and everyday contexts.
褐炭は低品位の石炭です。
Brown coal is a low-grade coal.
An older or more technical term for lignite or sub-bituminous coal. Less common in modern usage but still found in academic or historical texts.
この地域では亜炭が採掘されていました。
Lignite was mined in this region.