GNU Collaborative International Dictionary of English

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1.       
   Lactone (?), n. (Chem.) 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]