[ˈheɪlə(ʊ)dʒ(ə)n], (Noun)

Definitions:
- any of the elements fluorine, chlorine, bromine, iodine, and astatine, occupying group VIIA (17) of the periodic table. They are reactive non-metallic elements that form strongly acidic compounds with hydrogen from which simple salts can be made


Phrases:

Origin:
mid 19th century: from Greek hals, halo- ‘salt’ + -gen