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noun Chemistry.
any of a class of organic compounds containing a carbonyl group, CO, attached to two alkyl groups, as CH 3 COCH 3 or CH 3 COC 2 H 5 .
containing the ketone group.

1850–55; < German Keton, aphetic alteration of Aceton acetone

ketonic [ki-ton-ik] , adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
ketone (ˈkiːtəʊn)
See also acetone any of a class of compounds with the general formula R′COR, where R and R′ are alkyl or aryl groups
[C19: from German Keton, from Aketonacetone]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1851, "group of chemicals containing CO," from Ger. keton, coined in 1848 by Ger. chemist Leopold Gmelin (1788-1853) from Ger. Aketon, from Fr. acétone (see acetone).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

ketone ke·tone (kē'tōn')
Any of a class of organic compounds having a carbonyl group linked to a carbon atom in each of two hydrocarbon radicals.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
ketone   (kē'tōn')  Pronunciation Key 
Any of a class of organic compounds having the general formula RCOR', where R and R' are hydrocarbon radicals that are both attached to the carbon atom of the carbonyl (CO) group. Acetone is a ketone.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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