Another variant spelling of brimstone; sulfur or a burning, sulfurous substance associated with hellfire in religious tradition.
Dialectal variant of 'brimstone,' showing how 'brum-' became an alternative pronunciation in various English regions; the spelling reflects how Middle English speakers heard and recorded the word.
Different regions spelled words phonetically based on their own accents, so you get 'brimstone,' 'brumstone,' and 'brumstane'—all the same thing, just transcribed by different ears across medieval England.
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