brimstone

 
Pronunciation: /ˈbrɪmst(ə)n, -stəʊn/

noun

  • 1 [mass noun] archaic sulphur.
  • 2a bright yellow butterfly or moth:
    • (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). (also brimstone moth) a small yellow European moth (Opisthograptis luteolata, family Geometridae).

Origin:

late Old English brynstān, probably from bryne 'burning' + stān 'stone'