The meaning of Brimstone in the Bible
(From 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 (Genesis 19:24,25). In Isaiah 34:9 allusion is made to the destruction of these cities. This word figuratively denotes destruction or punishment (Job 18:15; Isaiah 30:33; 34:9; Psalms 11:6; Ezekiel 38:22). It is used to express the idea of excruciating torment in Revelation 14:10; 19:20; 20:10.

See more on the meaning of Brimstone in the Bible:
Brimstone {International Standard Bible Encyclopedia}

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