- Main Entry:
- ton·er
- Pronunciation:
-
\ˈtō-nər\
- Function:
- noun
- Date:
- 1888
: one that tones or is a source of tones: as a: a solution used to impart color to a silver photographic image b: a substance (as a thermoplastic powder) used especially to develop an image (as a latent xerographic image) on a piece of paper c: a liquid cosmetic for cleansing the skin and contracting the pores