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The Collaborative International Dictionary of English v.0.48:

Phenyl \Phe"nyl\, n. [Gr. fai`nein to bring to light + -yl: cf. F. ph['e]nyle. So called because it is a by-product of illuminating gas.] (Chem.) A hydrocarbon radical (C6H5) regarded as the essential residue of benzene, and the basis of an immense number of aromatic derivatives. [1913 Webster] 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. [1913 Webster + PJC]