Source : Webster's Revised Unabridged Dictionary (1913)

Benzoyl \Ben"zoyl\, n. [Benzoic + Gr. ? wood. See {-yl}.]
   (Chem.)
   A compound radical, {C6H5.CO}; the base of benzoic acid, of
   the oil of bitter almonds, and of an extensive series of
   compounds. [Formerly written also {benzule}.]