Definition of brimstone in US English:

brimstone

noun

  • 1archaic mass noun Sulfur.

    • ‘A fog covered her vision, a dark fog that smelt of burning brimstone.’
    • ‘At times mournful, and at other times gently consoling, there's little about it that smells of brimstone.’
    • ‘And still the wall of steam and brimstone advanced…’
    • ‘No creatures reeking of brimstone entered our church.’
    • ‘The smell of blood and brimstone filled the air.’
  • 2A bright yellow butterfly or moth.

    (also 'brimstone moth') a small yellow European moth (Opisthograptis luteolata, family Geometridae)

    (also 'brimstone butterfly') a European butterfly of the white family, the male of which is yellow and the female greenish-white (Gonepteryx rhamni, family Pieridae)

    • ‘And who wouldn't enjoy the sight of the first brimstone of the year eagerly supping at a garden primrose.’
    • ‘Reminding me of an animated daffodil, a male brimstone butterfly flits through the sun-dappled shade.’
    • ‘Many interesting moths showed throughout this year including the Brimstone.’

Origin

Late Old English brynstān, probably from bryne ‘burning’ + stān ‘stone’.

Pronunciation

brimstone

/ˈbrimˌstōn//ˈbrɪmˌstoʊn/