[ lak-tohn ]
/ ˈlæk toʊn /

noun Chemistry.

any of a group of internal esters derived from hydroxy acids.

Nearby words

  1. lactogenesis,
  2. lactogenic,
  3. lactogenic hormone,
  4. lactoglobulin,
  5. lactometer,
  6. lactonic,
  7. lactonize,
  8. lactoprotein,
  9. lactorrhea,
  10. lactoscope

Origin of lactone

First recorded in 1840–50; lact- + -one

Related formslac·ton·ic [lak-ton-ik] /lækˈtɒn ɪk/, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for lactone


/ (ˈlæktəʊn) /


any of a class of organic compounds formed from hydroxy acids and containing the group -C(CO)OC-, where the carbon atoms are part of a ring
Derived Formslactonic (lækˈtɒnɪk), adjective

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

Medicine definitions for lactone


[ lăktōn′ ]


An anhydride formed by the removal of a water molecule from the hydroxyl and carboxyl radicals of hydroxy acids.
Related formslac•tonic (-tŏnĭk) adj.

The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Science definitions for lactone


[ lăktōn′ ]

Any of various organic esters derived from organic acids by removal of water. Lactones are formed when the carboxyl (COOH) group of the acid reacts with a hydroxyl (OH) group in the same acid, releasing water and causing the carbon atom to join to the hydroxyl's remaining oxygen atom, forming a ring. Vitamin C, the antibiotic erythromycin, and many commercially important substances are lactones.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.