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From: Webster's Revised Unabridged Dictionary (1913)

 Phe·nyl n.  Chem. A hydrocarbon radical (C6H5) regarded as the essential residue of benzene, and the basis of an immense number of aromatic derivatives.
 Phenyl hydrate Chem., phenol or carbolic acid.
 Phenyl hydrazine Chem., a nitrogenous base (C6H5.NH.NH2) produced artificially as a colorless oil which unites with acids, ketones, etc., to form easily crystallized compounds.  It is used in organic chemistry, particulary to isolate compounds in pure form for analysis.
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