n. A univalent hydrocarbon radical (C6H5) formally derived from benzene by the removal of a hydrogen atom, and the basis of an immense number of aromatic derivatives.
the GNU version of the Collaborative International Dictionary of English
n. A hydrocarbon radical (C6H5) regarded as the essential residue of benzene, and the basis of an immense number of aromatic derivatives.
The Century Dictionary and Cyclopedia
n. An organic radical (C6H5; in the free state, C12H10) found in phenol (or carbolic acid), benzol, and aniline.
Word Usage
"Phenylalanine (a molecule of alanine to which an atom combination called the phenyl group is added),"