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Medical Definition of histone. : any of various simple water-soluble proteins that are rich in the basic amino acids lysine and arginine and are complexed with DNA in the nucleosomes of eukaryotic chromatin.
In chemistry, a ketone (alkanone) /ËkiËtoÊn/ is an organic compound with the structure RC(=O)R', where R and R' can be a variety of carbon-containing substituents. Ketones and aldehydes are simple compounds that contain a carbonyl group (a carbon-oxygen double bond).he word ketone derives its name from Aketon, an old German word for acetone. According to the rules of IUPAC nomenclature, ketones are named by changing the suffix-ane of the parent alkane to-anone. The position of the carbonyl group is usually denoted by a number.