Definition of hydroxyl in English:

hydroxyl

noun

Chemistry
  • [as modifier] Of or denoting the radical —OH, present in alcohols and many other organic compounds.

    ‘a hydroxyl group’
    • ‘Water always contains small quantities of two ions, hydronium ions and hydroxyl ions (OH -).’
    • ‘At present the evidence for hydroxyl radicals being mutagenic is limited.’
    • ‘In the atmosphere the hydroxyl radicals oxidise nitrates to form ozone.’
    • ‘Phenols are a subgroup of alcohol in which the hydroxyl groups are attached directly to the carbon atoms of a ring structure.’
    • ‘The carbonyl group can be broken down by the action of hydrogen cyanide; a hydroxyl group and a nitrile group are formed in this reaction.’

Origin

Mid 19th century: from a blend of hydrogen and oxygen, + -yl.

Pronunciation

hydroxyl

/hīˈdräksəl/