halogen
/ˈhælədʒɪn/noun
1- Chemistry any of the elements fluorine, chlorine, bromine, iodine, and astatine, occupying group VIIA (17) of the periodic table. They are reactive non-metallic elements which form strongly acidic compounds with hydrogen from which simple salts can be made.【化】卤（素）。
1.1
- as modifier denoting lamps and radiant heat sources using a filament surrounded by the vapour of iodine or another halogen（灯, 热辐射源）卤素的：
a halogen bulb.
卤素灯泡。
派生词
halogenic
adjective词源
mid 19th cent.: from Greek hals, halo- 'salt' + -GEN.