noun. The univalent group OH, a characteristic component of bases, certain acids, phenols, alcohols, carboxylic and sulfonic acids, and amphoteric compounds.

noun. A compound radical (OH) which has never been isolated, but which is a factor in a vast number of chemical compounds.

noun. A compound radical, or unsaturated group, HO, consisting of one atom of hydrogen and one of oxygen. It is a characteristic part of the hydrates, the alcohols, the oxygen acids, etc.

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

noun. the monovalent group -OH in such compounds as bases and some acids and alcohols

"(SIMS), which allowed them to analyze the grains for a compound known as hydroxyl, which can be incorporated into apatite's chemical structure if the mineral crystallizes from magma that contains water."

hydroxide  

hydroxyl ion  hydroxylamine  hydroxylammonium nitrate  hydroxylapatite  hydroxylate  

chemical group  group  radical  

acyl  alkoxy  allylic  benzyl  bridgehead