/toh"neuhr/ , n.
1. a person or thing that tones.
2. a highly concentrated organic pigment containing little or no inert matter.
3. a powder, either dry or dispersed in an organic liquid, used in xerography to produce the final image.
4. Also called chemical toner . Photog., Motion Pictures. 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.
[ 1885-90; TONE + -ER 1 ]