or hy·drox·y

[ hahy-drok-suhl ]


  1. containing the hydroxyl group.


/ haɪˈdrɒksɪl /


  1. modifier of, consisting of, or containing the monovalent group -OH or the ion OH

    a hydroxyl group or radical


/ hī-drŏksĭl /

  1. The group OH. Hydroxyl is present in bases, certain acids, hydroxides, and alcohols.

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Derived Forms

  • ˌhydroxˈylic, adjective

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Other Words From

  • hy·drox·yl·ic [hahy-drok-, sil, -ik], adjective

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Word History and Origins

Origin of hydroxyl1

First recorded in 1865–70; hydr- 2 + ox(y)- 2 + -yl

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Compare Meanings

How does hydroxyl compare to similar and commonly confused words? Explore the most common comparisons:

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Example Sentences

That hydroxyl-containing part of RNA is not an entire RNA monomer.

Rheinberger and his team copied this hydroxyl-containing part of RNA and used it to link some of PLA’s monomers.

This pair is called a hydroxyl group and has a tiny negative charge.

Specifically, small compounds called hydroxyl groups, which consist of hydrogen and oxygen atoms, do most of the work.

The assumption was that it was in the form of hydroxyl, which is made of one oxygen atom and one hydrogen atom—a stable molecule that would naturally form in a regolith where oxygen is also present.

From Time

Another toxic component of the fuel was hydroxyl-terminated polybutadiene, a form of rubber.

Those four atoms are called the methyl group, and a methyl group combined with a hydroxyl group forms methyl alcohol.

First, the hydrogen is displaced by the chlorine: then the chlorine is turned out and its place taken by the hydroxyl.

It is best detected in acid solutions by the deep brown or iodine colour developed on adding hydroxyl.

Now these phenols are all more or less acid in character by virtue of the hydroxyl-group which they contain.

The substitution of a hydrogen atom by the hydroxyl group generally occasions a rise in boiling-point at about 100.