AskDefine | Define hydroxyl

Dictionary Definition

hydroxyl n : the monovalent group -OH in such compounds as bases and some acids and alcohols [syn: hydroxyl group, hydroxyl radical]

User Contributed Dictionary



  1. A univalent radical or functional group, (-OH), in organic chemistry; present in alcohols, phenols, carboxylic acids and certain other classes of compounds

Related terms


Extensive Definition

This article is about the hydroxyl functional group. For the Hydroxyl radical see Hydroxyl radical.
Hydroxyl in chemistry stands for a molecule consisting of an oxygen atom and a hydrogen atom connected by a covalent bond. The neutral form is a hydroxyl radical and the hydroxyl anion is called a hydroxide. When the oxygen atom is linked to a larger molecule the hydroxyl group is a functional group (HO¯ or ¯OH) .

Hydroxyl group

The term hydroxyl group is used to describe the functional group –OH when it is a substituent in an organic compound. Organic molecules containing a hydroxyl group are known as alcohols (the simplest of which have the formula CnH2n+1–OH).

Hydroxyl radical

The hydroxyl radical, ·OH, is the neutral form of the hydroxide ion. Hydroxyl radicals are highly reactive and, as a consequence, short-lived; however, they form an important part of radical chemistry.
hydroxyl in Arabic: هيدروكسيل
hydroxyl in Catalan: Grup hidroxil
hydroxyl in Czech: Hydroxyl
hydroxyl in German: Hydroxylgruppe
hydroxyl in Spanish: Grupo hidroxilo
hydroxyl in Esperanto: Hidroksila grupo
hydroxyl in French: Groupement hydroxyle
hydroxyl in Indonesian: Hidroksil
hydroxyl in Icelandic: Hýdroxýl
hydroxyl in Italian: Ione idrossido
hydroxyl in Dutch: Hydroxylgroep
hydroxyl in Japanese: ヒドロキシ基
hydroxyl in Polish: Grupa hydroksylowa
hydroxyl in Portuguese: Hidroxila
hydroxyl in Russian: Гидроксильная группа
hydroxyl in Finnish: Hydroksyyli
hydroxyl in Swedish: Hydroxylgrupp
hydroxyl in Thai: ไฮดรอกซิล
hydroxyl in Turkish: Hidroksil
hydroxyl in Vietnamese: Hiđrôxyl
hydroxyl in Ukrainian: Гідроксил
hydroxyl in Chinese: 羟基
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