Noun
a hard natural coal that burns slowly and gives intense heat
Source: WordNetDöschner highlighted that Germany also has experience with the phase-out of hard coal production, pointing out that the last mine will close next year. Source: Internet
Most of district heat was produced with wood fuels and hard coal. Source: Internet
“We left Buffalo Nov. 7, 1913, bound for Milwaukee, Wis., with hard coal. Source: Internet