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Definition of: ethyl
(eth′il) noun Chem.
1. A univalent hydrocarbon radical, C2H5, of the paraffin series, denoting the presence of the radical in any of numerous compounds widely used in industry, medicine, and the arts: ethyl acetate, ethyl cellulose, etc.
2. Any gasoline treated with tetraethyl lead to reduce knock. [<ETHER + -YL]
—eth·yl′ic adjective
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