1. (

• sulfur ,
• S ,
• sulphur ,
• atomic_number_ ,

) an abundant tasteless odorless multivalent nonmetallic element; best known in yellow crystals; occurs in many sulphide and sulphate minerals and even in native form (especially in volcanic regions) ;

1. (

• sulphur ,
• sulfur

) treat with sulphur in order to preserve; "These dried fruits are sulphured" ;