halogen
Americannoun
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halogens
plural
noun
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Any of a group of five nonmetallic elements with similar properties. The halogens are fluorine, chlorine, bromine, iodine, and astatine. Because they are missing an electron from their outermost shell, they react readily with most metals to form salts.
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See Periodic Table
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Origin of halogen
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Explanation
A halogen is a chemical element that forms a salt when it reacts with metal. Halogen lamps are illuminated by bulbs that contain a halogen and an inert gas. There are five halogens in the periodic table of chemical elements: fluorine, chlorine, bromine, iodine, and astatine. The halogens are all highly reactive, which means they're quick to form bonds with other elements. What they often end up becoming is some kind of salt, including common table salt. In fact, the literal translation of halogen is "salt-producer," from Greek roots hals, "salt," and gen, "giving birth to."
Vocabulary lists containing halogen
Chemistry - High School
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Structure and Properties of Matter - High School
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Example Sentences
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He did a more-than-competent job—he was Rossini after all—but the result always reminds me of shining a halogen light into a place of hallowed dim.
From The Wall Street Journal ● May 15, 2026
The beam is whiter, more focused and brighter than the more diffuse light from halogen lamps fitted in older cars.
From BBC ● Oct. 27, 2025
One already well-understood source of glare is drivers retrofitting their vehicles, replacing old halogen bulbs with LEDs.
From BBC ● Oct. 27, 2025
When a simple halogen lamp illuminates the tiny cavities, the light inside is captured as if in a trap.
From Science Daily ● Oct. 23, 2025
As the broiling sun set, a different kind of American landscape lit up: The halogen floodlights from the truck stop could be seen for miles.
From "Geeks: How Two Lost Boys Rode the Internet Out of Idaho" by Jon Katz
By combining different halide salts, researchers created MXenes with two or even three types of surface halogens in carefully controlled proportions.
From Science Daily ● Apr. 4, 2026
Firstly, they are two to three times as bright as traditional halogens, and their "colour temperature" is bluer and whiter, which mimics natural daylight.
From BBC ● Feb. 18, 2026
Researchers also found that halogens interact with oil field emissions to form free radicals, which later become more stable compounds capable of traveling long distances.
From Science Daily ● Dec. 29, 2025
This trend is illustrated for the covalent radii of the halogens in Table 6.2 and Figure 6.30.
From Textbooks ● Feb. 14, 2019
Inasmuch, however, as bromine and iodine combine with fluorine, as previously described, these halogens do not escape, but burn up to their respective fluorides.
From Scientific American Supplement, No. 832, December 12, 1891 by Various
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