Definition of carboxyl in English:

carboxyl

(also carboxy)

noun

Chemistry
  • [as modifier] Of or denoting the acid radical —COOH, present in most organic acids.

    ‘the carboxyl group’
    • ‘The ‘head’ of the molecule contains a phosphate group, glycerol, and the carboxyl groups from two long-chain fatty acids.’
    • ‘The carboxyl group of lysergic acid has been reduced to a methyl group.’
    • ‘It is a weak organic acid that contains a carboxyl group.’
    • ‘This is caused by a dehydration reaction between the hydroxyl group from the glycerol and the carboxyl groups of the fatty acids.’
    • ‘Natural proteins are made up of alpha-amino acids, which have a carboxyl group and an amino group separated by one carbon atom.’

Origin

Mid 19th century: from carbo- + ox- ‘oxygen’+ -yl.

Pronunciation:

carboxyl

/kɑːˈbɒksʌɪl//kɑːˈbɒksɪl/