Etymology
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toner (n.)

1888, agent noun from tone (v.). As a photography chemical, from 1920; in xerography, from 1954.

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Definitions of toner

toner (n.)
a solution containing chemicals that can change the color of a photographic print;
toner (n.)
a black or colored powder used in a printer to develop a xerographic image;
toner (n.)
a lotion for cleansing the skin and contracting the pores;
From wordnet.princeton.edu