In chemistry, an ethyl group is an alkyl substituent derived from ethane (C2H6). It has the formula -C2H5 and is very often abbreviated -Et. Ethyl is the IUPAC nomenclature of organic chemistry term for an alkane (or alkyl) molecule, using the prefix "eth-" to indicate the presence of two carbon atoms in the molecule.
Read more about Ethyl Group: Ethylation, Etymology
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—John Dos Passos (1896–1970)