lactone

 : 
Noun
 : 
lac=tone

CIDE DICTIONARY

lactonen. 
     One of a series of organic compounds, being cyclic esters which may be regarded as anhydrides of certain hydroxy acids. In general, they are colorless liquids, having a weak aromatic odor. They are so called because the typical lactone is derived from lactic acid.  [1913 Webster]

OXFORD DICTIONARY

lactone, n. Chem. any of a class of cyclic esters formed by the elimination of water from a hydroxy-carboxylic acid.

Etymology
G Lacton

For further exploring for "lactone" in Webster Dictionary Online


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