halogen

名词 halogen:

1. any of five related nonmetallic elements (fluorine or chlorine or bromine or iodine or astatine) that are all monovalent and readily form negative ions

hal.o.gen

n.（名词）
Any of a group of five chemically related nonmetallic elements including fluorine, chlorine, bromine, iodine, and astatine.
卤素：包括氟、氯、溴、磺、砹有化学关系的五个非金属元素一族中的任何一个

来源：
Swedish
瑞典语
halo- [halo-]
halo- [前缀，表示含卤素的]
-gen [-gen]
-gen [后缀，表示产生者，被生产或发生者]

【引伸】
halog.enous