noun
: bituminous coal in the large lumps remaining after a single screening that is often designated by the size of the mesh over which it passes and by which the minimum size lump is determined
3/4-inch lump coal
2-inch lump coal
noun
: bituminous coal in the large lumps remaining after a single screening that is often designated by the size of the mesh over which it passes and by which the minimum size lump is determined
3/4-inch lump coal
2-inch lump coal
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012