'coal-derived' originates from the combination of 'coal' and 'derived', where 'coal' refers to a combustible black or brownish-black sedimentary rock, and 'derived' means obtained from a specified source.

'coal-derived' is a modern English term formed by combining 'coal' and 'derived', reflecting the process of obtaining substances from coal.

Initially, it meant 'obtained from coal', and this meaning has largely remained the same in modern usage.