toner

UK: /ˈtəʊnə^r/ US: (tō′nər)

WordReference Random House Unabridged Dictionary of American English © 2025

ton•er  (tō′nər), n. 

1. a person or thing that tones.
2. a highly concentrated organic pigment containing little or no inert matter.
3. Printing a powder, either dry or dispersed in an organic liquid, used in xerography to produce the final image.
4. Photography Also called chemical toner. a chemical solution used to change the color of and, in some cases, help preserve black-and-white prints and motion-picture film by altering or replacing the silver image.
5. a worker for a paint manufacturer who tests the color and quality of paint.
6. a cosmetic preparation, usually a liquid, used to restore firmness to the skin.

• tone + -er¹ 1885–90

Collins Concise English Dictionary © HarperCollins Publishers::

toner / ˈtəʊnə/ noun

1. a person or thing that tones or produces tones, esp a concentrated pure organic pigment
2. a cosmetic preparation that is applied to produce a required effect, such as one that softens or alters hair colour or one that reduces the oiliness of the skin
3. a chemical solution that softens or alters the colour of the tones of a photographic image
4. a powdered chemical used in photocopying machines and laser printers, which is transferred onto paper to form the printed image