halogen

Etymology

It is borrowed from Swedish halogen,^{[2][3][4][5][6]} coined by the Swedish chemist Jöns Jakob Berzelius,^[2][3][7] literally "salt-producer",^[2][7] from Ancient Greek ἅλς (háls, “salt”), with the combining form ἁλο- (halo-),^[8][2][3][9] and the suffix -gen,^[2][3][8] which goes back through French -gène to Ancient Greek -γενής (-genḗs, “born of, produced by”).^[2][8] It was so called because these elements form a salt by combining directly with a metal.^[3][2] The Greek word is from Proto-Indo-European *sal- (“salt”), the root of salt.^[2] The OED treats the word as a modern formation from the Greek and -gen, comparing French halogène.^[8]

Earliest recorded meaning

An element that forms a salt by direct union with a metal: 1842 in Barnhart, Etymonline and Merriam-Webster Unabridged,^[3][2][4] 1844 in the OED, which has its first quotation from the Proceedings of the American Philosophical Society.^[8]

Semantic evolution

The name described the chemistry of the elements Berzelius grouped: chlorine, bromine, iodine and fluorine all form salts on reacting with metals.^[2][3] The OED's original definition (1898) still counted the compound cyanogen among the halogens,^[8] while modern dictionaries list the five elements fluorine, chlorine, bromine, iodine and astatine, the group VIIA of the periodic table.^[4][9][6] From 1880 the word was also used attributively, of things containing or using a halogen,^[4] most familiarly in the halogen lamp, whose filament is surrounded by a halogen gas.^[4][1]

Timeline

• 1842 – any of the elements that form salts by uniting directly with metals.^[3][2][4] The OED's first quotation is from 1844.^[8]
• 1880 – attributive, containing or using a halogen.^[4]

Meanings

Noun

1. Any of the chemical elements fluorine, chlorine, bromine, iodine and astatine, which form group VIIA (group 17) of the periodic table and readily combine with metals to form salts.^[4][6][9][1]
2. A lamp or light whose filament is surrounded by a halogen gas.^[1][4]

Adjective

1. Containing or using a halogen: a halogen bulb.^[4]

Word family

• halogenous
• halogenate
• halon
• halothane
• halogen lamp

Related words

• halide
• halite
• halo-
• -gen
• salt
• oxygen

References

1. ^ a b c d Wiktionary, the free dictionary, https://en.wiktionary.org
2. ^ a b c d e f g h i j k Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
3. ^ a b c d e f g h Barnhart, Robert K. (1988), The Barnhart Dictionary of Etymology
4. ^ a b c d e f g h i j Merriam-Webster Unabridged Dictionary (2024), online ed., Springfield, Mass.: Merriam-Webster
5. ^ The American Heritage Dictionary of the English Language (online 2024), 5th ed., Boston: Houghton Mifflin Harcourt
6. ^ a b c Collins English Dictionary (2023), Glasgow: HarperCollins
7. ^ a b Klein, Ernest. A Comprehensive Etymological Dictionary of the English Language. 2 vols. Amsterdam: Elsevier, 1966–1967.
8. ^ a b c d e f g Oxford English Dictionary Online (accessed March 2026), Oxford: Oxford University Press
9. ^ a b c Shorter Oxford English Dictionary on Historical Principles (2002), 5th ed., ed. William R. Trumble and Angus Stevenson, Oxford: Oxford University Press