benzo-

1. a combining form used in the names of chemical compounds in which benzene, benzoic acid, or one or more of the phenyl groups is present: benzocaine.

combining form

1. indicating a benzene ring fused to another ring in a polycyclic compoundbenzofuran
2. indicating derivation from benzene or benzoic acid or the presence of phenyl groupsbenzophenone

pref.

1. Benzene; benzoic acid:benzodiazepine.