Source : Webster's Revised Unabridged Dictionary (1913)

Phenyl \Phe"nyl\, n. [Gr. ? 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.

   {Phenyl hydrate} (Chem.), phenol or carbolic acid.

   {Phenyl hydrazine} (Chem.), a nitrogenous base ({C6H5.N2H3})
      produced artificially as a colorless oil which unites with
      acids, ketones, etc., to form well-crystallized compounds.