1. An abundant tasteless odourless multivalent nonmetallic element; best known in yellow crystals; occurs in many sulphide and sulphate minerals and even in native form (especially in volcanic regions)
   - sulfur [N. Amer], S, sulphur [Brit, Cdn]

Type of: chemical element, element

Part of: oil of vitriol, sulfide [N. Amer], sulfuric acid [N. Amer], sulphide [Brit, Cdn], sulphuric acid [Brit, Cdn], vitriol

• irruption
• irruptive
• IRS
• Irtish
• Irtish River
• Irtysh
• Irtysh River
• Irula
• Irving
• Irving Berlin
• Irving Howe
• Irving Langmuir
• Irvingia
• Irvingia gabonensis
• ISA
• Isaac
• Isaac Asimov
• Isaac Bashevis Singer
• Isaac Hull
• Isaac M. Singer
• Isaac Mayer Wise
• Isaac Merrit Singer
• Isaac Newton
• Isaac Stern
• Isaac Watts