chemical element, element - any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter

brimstone, native sulfur, native sulphur - an old name for sulfur

sulfide, sulphide - a compound of sulphur and some other element that is more electropositive

oil of vitriol, sulfuric acid, sulphuric acid, vitriol - (H2SO4) a highly corrosive acid made from sulfur dioxide; widely used in the chemical industry

process, treat - subject to a process or treatment, with the aim of readying for some purpose, improving, or remedying a condition; "process cheese"; "process hair"; "treat the water so it can be drunk"; "treat the lawn with chemicals" ; "treat an oil spill"