Archaic or dialectal term for brimstone; sulfur or a sulfurous substance, particularly as referenced in religious contexts involving hell and damnation.
Variant or corruption of 'brimstone,' from Old English 'brynstan' (burning stone); the 'brum-' spelling appears in Scottish and Northern English dialects as a phonetic variation.
Medieval preachers terrified their congregations with descriptions of fire and brumstane—the word became so associated with hellfire that it's basically a vocabulary time capsule of religious fear.
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