bromine

 
Pronunciation: /ˈbrəʊmiːn/

noun

[mass noun]
  • the chemical element of atomic number 35, a dark red fuming toxic liquid with a choking, irritating smell. It is a member of the halogen group and occurs chiefly in the form of salts in seawater and brines. (Symbol: Br)

Origin:

early 19th century: from French brome, from Greek brōmos 'a stink', + -ine4