Is it farther or further?


[kee-tohn] /ˈki toʊn/
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
Related forms
[ki-ton-ik] /kɪˈtɒn ɪk/ (Show IPA),
adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
Cite This Source
Examples from the web for ketones
  • Her brain is certainly doing better burning on ketones instead of glucose.
  • ketones are the end-product of rapid or excessive fatty-acid breakdown.
  • ketones are substances produced when fat cells break down in the blood.
  • As fats are broken down, acids called ketones build up in the blood and urine.
  • ketones are a type of acid that form when the body breaks down fat for energy.
British Dictionary definitions for ketones


any of a class of compounds with the general formula R′COR, where R and R′ are alkyl or aryl groups See also acetone
Derived Forms
ketonic (kɪˈtɒnɪk) adjective
Word Origin
C19: from German Keton, from Aketonacetone
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Cite This Source
Word Origin and History for ketones



chemical group, 1851, from German keton, coined in 1848 by German chemist Leopold Gmelin (1788-1853) from German Aketon, from French acétone (see acetone). Its comb. form is keto-.

Online Etymology Dictionary, © 2010 Douglas Harper
Cite This Source
ketones in Medicine

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.
Cite This Source
ketones in Science
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.
Cite This Source

Word of the Day

Difficulty index for ketone

Most English speakers likely know this word

Word Value for ketones

Scrabble Words With Friends

Nearby words for ketones