Etymology
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ethyl (n.)

1838, from German ethyl (Liebig, 1834), from ether + -yl. Ethyl alcohol, under other names, was widely used in medicine by 13c.

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Definitions of ethyl

ethyl (n.)
the univalent hydrocarbon radical C2H5 derived from ethane by the removal of one hydrogen atom;
Synonyms: ethyl group / ethyl radical
From wordnet.princeton.edu