Definition of toner
: one that tones or is a source of tones: such as
a
: a substance (such as a thermoplastic powder) used especially to develop an image (such as a latent xerographic image) on a piece of paper
b
: a liquid cosmetic for cleansing the skin and contracting the pores
c
: a solution used to impart color to a silver photographic image
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Merriam-Webster unabridged
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Time Traveler for toner
The first known use of toner was in 1888
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