n. A univalent radical formally derived from benzoic acid, C6H5CO-, by removal of the hydroxyl group
the GNU version of the Collaborative International Dictionary of English
n. A compound radical, C6H5.CO-; the base of benzoic acid, of the oil of bitter almonds, and of an extensive series of compounds.
The Century Dictionary and Cyclopedia
n. The radical (C7H5O) of benzoic acid, of oil of bitter almonds, and of an extensive series of compounds derived from this oil, or connected with it by certain relations.
Word Usage
"Topical acne treatments given to teenagers are used directly on the skin includes antibiotic lotions and azelaic acid that is described as a benzoyl peroxide alternative."