adj. Pale; bleak.v. To treat with bleach, especially so as to whiten (fabric, paper, etc) or lighten (hair).v. to lose color due to stress-induced expulsion of symbiotic unicellular algae.n. A chemical, such as sodium hypochlorite or hydrogen peroxide, or a preparation of such a chemical, used for disinfecting or whitening.n. A variety of bleach.n. An act of bleaching; exposure to the sun.n. A disease of the skin.