\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.