sulphur

/S AH1 L F ER0/
noun
  1. 1

    A chemical element (symbol S) with an atomic number of 16.

  2. 2

    A yellowish green colour, like that of sulfur.

Synonyms

verb
  1. 1

    To treat with sulfur, or a sulfur compound, especially to preserve or to counter agricultural pests.

noun
  1. 1

    Any of various pierid butterflies of the subfamily Coliadinae, especially the sulphur coloured species. Compare yellow.

Source: https://en.wiktionary.org/wiki/sulfur, https://en.wiktionary.org/wiki/sulphur