Pronunciation: (blēch),[key] —v.t. 1. to make whiter or lighter in color, as by exposure to sunlight or a chemical agent; remove the color from.
2. Photog.to convert (the silver image of a negative or print) to a silver halide, either to remove the image or to change its tone.
—v.i. to become whiter or lighter in color.
—n. 1. a bleaching agent.
2. degree of paleness achieved in bleaching.
3. an act of bleaching.