-_jə̇n, -ˌjen noun
( -s )
Etymology: Swedish, from halo- hal- + -gen
: any of the five elements fluorine, chlorine, bromine, iodine, and astatine forming part of group VII A of the periodic table and existing in the free state normally as diatomic molecules — compare pseudohalogen
• ha·log·e·nous (ˈ)ha|läjənəs adjective