Etymology
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halogen (n.)

general name for elements of the chlorine family, 1842, from Swedish, coined by Swedish chemist Baron Jöns Jakob Berzelius (1779-1848), literally "salt-producer," from Greek hals "salt" (from PIE root *sal- "salt") + -gen "giving birth to" (see -gen); so called because a salt is formed in reactions involving these four elements. Related: Halogenous.

updated on May 26, 2017

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Definitions of halogen from WordNet

halogen (n.)
any of five related nonmetallic elements (fluorine or chlorine or bromine or iodine or astatine) that are all monovalent and readily form negative ions;
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.