Various chemical compounds, especially ketones.
[Greek patronymic -ōnē.]
A ketone is an organic compound containing a carbonyl group ==C==O bonded to two alkyl groups. The simplest such compound is acetone (formal name propanone); another is butanone, methyl ethyl ketone; in systematic naming, the ending often appears hyphenated: 3,5-dimethylheptan-4-one.
A variety of more complex organic compounds contain the same ending, as for example benzoquinone, a yellow crystalline compound related to benzene; dithizone (more fully diphenylthiocarbazone), a synthetic compound used as a reagent for the analysis and separation of lead and other metals; glutathione, a compound involved as a coenzyme in oxidation-reduction reactions in cells.