hydroxyl group

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hydroxyl group (hīdrŏk´sĬl), in chemistry, functional group that consists of an oxygen atom joined by a single bond to a hydrogen atom. An alcohol is formed when a hydroxyl group is joined by a single bond to an alkyl group or aryl group. A metal hydroxide is formed when a hydroxyl group is joined to a metal (e.g., sodium hydroxide).

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hy·drox·yl / hīˈdräksəl/ • n. [as adj.] Chem. of or denoting the radical −OH, present in alcohols and many other organic compounds: a hydroxyl group.

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hydroxyl Denoting the group –OH in a chemical compound or the ion OH.