Phenyl

n.
  1. A hydrocarbon radical (C6H5) regarded as the essential residue of benzene, and the basis of an immense number of aromatic derivatives.
    2. 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.