Brimstone

Brimstone - (Easton's Bible Dictionary)

An inflammable mineral substance found in quantities on the shores of the Dead Sea. The cities of the plain were destroyed by a rain of fire and brimstone (Gen. 19:24, 25). In Isa. 34:9 allusion is made to the destruction of these cities. This word figuratively denotes destruction or punishment (Job 18:15; Isa. 30:33; 34:9; Ps. 11:6; Ezek. 38:22). It is used to express the idea of excruciating torment in Rev. 14:10; 19:20; 20:10.

Brimstone - (Webster's 1828 Dictionary)

BRIM'STONE, n. Sulphur; a hard, brittle, inflammable substance, of a lemon yellow color, which has no smell, unless heated, and which becomes negatively electric by heat and friction. It is found, in great quantities, and sometimes pure, in the neighborhood of volcanoes. It is an ingredient in a variety of minerals and ores. The sulphur of commerce is procured from its natural beds, or artificially extracted from pyrites.