brom·ineBrE /ˈbrəʊmiːn/ 🔊NAmE /ˈbroʊmiːn/ 🔊 noun [uncountable] (symbol Br) a chemical element. Bromine is a dark red poisonous liquid and has a very strong unpleasant smell. It is mainly found in the form of salts in sea water. 溴（富集于海水）