GNU Collaborative International Dictionary of English

Found one definition

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