Page "Ketone" Paragraph 4

Although used infrequently, " oxo " is the IUPAC nomenclature for a ketone functional group.

Other prefixes, however, are also used.

For some common chemicals ( mainly in biochemistry ), " keto " or " oxo " is the term used to describe the ketone functional group.

The term " oxo " is used widely through chemistry.

For example, it also refers to an oxygen atom bonded to a transition metal ( a metal oxo ).