GNU Collaborative International Dictionary of English

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1.       
   Ethyl , n. [Ether + -yl.] (Chem.) A monatomic, hydrocarbon radical, C2H5 of the paraffin series, forming the essential radical of ethane, and of common alcohol and ether.
   1913 Webster
   Ethyl aldehyde. (Chem.) See Aldehyde.
   1913 Webster