verb (used with object), i·on·ized, i·on·iz·ing.

to separate or change into ions.
to produce ions in.

verb (used without object), i·on·ized, i·on·iz·ing.

to become changed into the form of ions, as by dissolving.

Also especially British, i·on·ise.

Origin of ionize

First recorded in 1895–1900; ion + -ize
Related formsi·on·iz·a·ble, adjectivei·on·i·za·tion, nouni·on·iz·er, nounnon·i·on·ized, adjectivenon·i·on·iz·ing, adjectiveself-i·on·i·za·tion, nounun·i·o·nized, adjectiveun·un·ion·ized, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for ionizer

Historical Examples of ionizer

  • Mike took his ionizer from the top of the desk, walked over to the door, and began running it over the tape.

    Unwise Child

    Gordon Randall Garrett

British Dictionary definitions for ionizer




a person or thing that ionizes, esp an electrical device used within a room to refresh its atmosphere by restoring negative ions




to change or become changed into ions
Derived Formsionizable or ionisable, adjective
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

Word Origin and History for ionizer



1896, from ion + -ize. Related: Ionized; ionizing.

Online Etymology Dictionary, © 2010 Douglas Harper

ionizer in Medicine




To dissociate atoms or molecules into electrically charged atoms or radicals.
Related formsion•iz′er n.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

ionizer in Science



To give an atom or group of atoms a net electric charge by adding or removing one or more electrons.
To form ions in a substance. Lightning ionizes air, for example.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.