noun
a type of organic compound characterized by the presence of a carbonyl group (C=O) bonded to two other carbon atoms
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Ketones are organic compounds that contain a carbonyl group bonded to two alkyl groups.
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I learned in chemistry class that ketones have a carbonyl group.
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I have to study for my test on ketones and carbonyl groups.
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Her energy levels were like a ketone, fluctuating throughout the day.