1. A compound containing a potentially ionizable hydroxyl group; particularly a compound that liberates OH− upon dissolving in water. 2. The h. anion, OH−.
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hy·drox·ide hī-'dräk-.sīd n
1) the monovalent anion OH- consisting of one atom of hydrogen and one of oxygen called also hydroxide ion
2) an ionic compound of hydroxide with an element or group
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hy·drox·ide (hi-drokґsīd) any compound of hydroxyl radical (OH), or of hydroxide ion, OH−, with another radical or atom.Medical dictionary. 2011.