hal·​o·​gen | \ ˈha-lə-jən How to pronounce halogen (audio) \

Definition of halogen

 (Entry 1 of 2)

: any of the five elements fluorine, chlorine, bromine, iodine, and astatine that form part of group VIIA of the periodic table and exist in the free state normally as diatomic molecules



Definition of halogen (Entry 2 of 2)

: containing, using, or being a halogen a halogen lamp

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Other Words from halogen


halogenous \ ha-​ˈlä-​jə-​nəs How to pronounce halogenous (audio) \ adjective

Examples of halogen in a Sentence

Recent Examples on the Web: Noun That will ban sales of standard incandescent bulbs, which produce 15 to 20 lumens per watt, and halogen bulbs, which are in the same range. Bob Egelko, SFChronicle.com, "Ruling allows California to start enforcing efficiency standards for light bulbs," 31 Dec. 2019 Neither incandescent nor halogen bulbs met the requirements set to take effect Jan. 1. BostonGlobe.com, "The Trump administration gave old-fashioned, incandescent lightbulbs a holiday gift Friday: a new lease on life.," 21 Dec. 2019 Of all the latest advanced driver safety aids, Edmunds’ editors point to this safety system as the most useful and least intrusive on a daily basis. High-intensity discharge (HID) and LED headlights are quickly replacing traditional halogen lights. Washington Post, "Edmunds’ experts pick their favorite must-have car features," 27 Nov. 2019 Heated hand grips, halogen lights, and drift cutters round out the standard features. Bradley Ford, Popular Mechanics, "The Best Snowblowers for Any Size Job," 23 Oct. 2019 The raw audio of that passage from the news conference was tracked down by Adam Cohen and the engineer Michael Chaves, who mixed out the buzzing tone of the room’s halogen lights and composed around it a gentle, unobtrusive piano melody. Lindsay Zoladz, New York Times, "A Last Dance for Leonard Cohen," 20 Oct. 2016 Also, never use your bare hands to change a halogen bulb. Joseph Truini, Popular Mechanics, "Let There Be Light: A Smart Buyer’s Guide to Light Bulbs," 14 June 2019 The first regulation being targeted was spun off of a 2007 law signed by President George W. Bush that aimed to gradually phase out energy inefficient bulbs like incandescent and halogen bulbs. Phil Helsel, NBC News, "Trump: I look orange, but so do you because of energy-efficient light bulbs," 13 Sep. 2019 The 2017 Obama regulations built upon a 2007 law passed during the George W. Bush administration that began phasing out the most inefficient incandescent and halogen bulbs. Sophie Lewis, CBS News, "Trump rolls back Obama-era regulations on energy-efficient light bulbs," 4 Sep. 2019 Recent Examples on the Web: Adjective On Home Depot’s website, the group found different prices quoted for paint, light bulbs, toilet paper, caulk guns, halogen floor lamps, screwdrivers and more. Levi Sumagaysay, The Mercury News, "FTC urged to probe ‘secret surveillance scores’ used against shoppers, job and housing applicants," 25 June 2019 Test Results: Maximum Cubby Storage Exterior Measurement Comparisons Every 124 Spider comes standard with a manual softtop that’s effortless to fold down, plus halogen headlights and LED taillights. Car and Driver, "2018 Fiat 124 Spider," 2 Nov. 2017

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'halogen.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of halogen


1842, in the meaning defined above


1880, in the meaning defined above

History and Etymology for halogen


Swedish, from hal- + -gen

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Time Traveler for halogen

Time Traveler

The first known use of halogen was in 1842

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Statistics for halogen

Last Updated

8 Jan 2020

Cite this Entry

“Halogen.” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/halogens. Accessed 17 January 2020.

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More Definitions for halogen


halo·​gen | \ ˈhal-ə-jən How to pronounce halogen (audio) \

Medical Definition of halogen

: any of the five elements fluorine, chlorine, bromine, iodine, and astatine that form part of group VII A of the periodic table and exist in the free state normally as diatomic molecules

Other Words from halogen

halogenous \ ha-​ˈläj-​ə-​nəs How to pronounce halogenous (audio) \ adjective

More from Merriam-Webster on halogen

Britannica.com: Encyclopedia article about halogen

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a plan in which a last survivor takes all

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