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Showing results for halogen. Search instead for hyalogen.
Synonyms

halogen

American  
[hal-uh-juhn, -jen, hey-luh-] / ˈhæl ə dʒən, -ˌdʒɛn, ˈheɪ lə- /

noun

Chemistry.

  1. any of the electronegative elements, fluorine, chlorine, iodine, bromine, and astatine, that form binary salts by direct union with metals.

halogen British  
/ ˈhæləˌdʒɛn, həˈlɒdʒɪnəs /

noun

  1. any of the chemical elements fluorine, chlorine, bromine, iodine, and astatine. They are all monovalent and readily form negative ions

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
halogen Scientific  
/ hăl′ə-jən /

  1. 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.

  2. See Periodic Table

Other Word Forms

  • halogenoid adjective
  • halogenous adjective

Etymology

Origin of halogen

First recorded in 1835–45; halo- + -gen

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Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Also, LED lights "are a lot more directional, so you've got this much brighter, whiter light in a very directional point hitting your eye compared to the more diffuse halogen ones".

From BBC • Feb. 18, 2026

The housing for halogen bulbs is not compatible with LED bulbs, and a retrofitted car will not pass its annual MOT check-up.

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

Researchers uncover how the halogen bond can be exploited to direct sequential dynamics in the multi-functional crystals, offering crucial insights for developing ultrafast-response times for multilevel optical storage.

From Science Daily • Jun. 4, 2024

This was a modern room with a curving steel desk near the center, carefully positioned halogen lights, and a spiral staircase leading down from a perfect circle cut in the ceiling about fifteen feet high.

From "Stormbreaker" by Anthony Horowitz

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.