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.
The ionosphere interacts strongly with the sun, which explains the layer's name: its atoms and molecules are ionized (have had electrons stripped away) by solar radiation. Mike Wall, Space.com, 25 July 2025 The researchers noted that communities downstream from Coldwater Creek had potentially been exposed to the ionizing radiation during recreational activities, such as playing in the creek, and residential activities, like breathing in dust suspended from the soil when gardening. Angelica Stabile, FOXNews.com, 22 July 2025 When a hazard, such as ultraviolet light, ionizing radiation or certain chemicals, damages DNA, the cell needs to respond at breakneck speed. Dan Samorodnitsky, Quanta Magazine, 14 July 2025 His handheld radiation monitor detected ionizing radiation that was alarmingly high, though not lethal, and the following day he was diagnosed with radiation burns on his head and hand. Matt Zoller Seitz, Vulture, 30 June 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 19 Aug. 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

Last Updated: - Updated example sentences
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