ionize

verb

ion·​ize ˈī-ə-ˌnīz How to pronounce ionize (audio)
ionized; ionizing

transitive verb

: to convert wholly or partly into ions
ionizable adjective
ionizer noun

Examples of ionize in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Both of those particles represent ionizing radiation, which can be harmful to human health. Margherita Bassi, Smithsonian Magazine, 21 Apr. 2025 Traveling at the speed of light, this radiation reaches Earth almost instantly, ionizing the upper atmosphere. Daisy Dobrijevic, Space.com, 28 Mar. 2025 The source of the ionizing emissions, the researchers said, is most likely either massive, hot stars (the earliest stars were likely 30–300 times more massive than our sun and millions of times more bright) or a supermassive black hole. Paul Du Quenoy, MSNBC Newsweek, 26 Mar. 2025 Terahertz waves have been proposed as a powerful tool to quickly transfer giant volumes of data in potential 6G networks and to see through solid matter, like X-rays—only without the hazardous ionizing radiation. IEEE Spectrum, 15 Mar. 2025 See All Example Sentences for ionize

Word History

Etymology

ion + -ize, after German ionisiren (now ionisieren) or French ioniser

First Known Use

1898, in the meaning defined at transitive sense

Time Traveler
The first known use of ionize was in 1898

Cite this Entry

“Ionize.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/ionize. Accessed 4 May. 2025.

Kids Definition

ionize

verb
ion·​ize ˈī-ə-ˌnīz How to pronounce ionize (audio)
ionized; ionizing
1
: to convert wholly or partly into ions
2
: to become ionized
ionizable adjective
ionization noun
ionizer noun

Medical Definition

ionize

verb
ion·​ize
variants or chiefly British ionise
ionized or chiefly British ionised; ionizing or chiefly British ionising

transitive verb

: to convert wholly or partly into ions
ionizable adjective
or chiefly British ionisable
ionization noun
or chiefly British ionisation

More from Merriam-Webster on ionize

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