Informal: a benzodiazepine; a sedative or anxiolytic drug.

• Colloquial shortening used in medical and drug contexts.

Combining form in chemical names indicating a benzene-fused ring.

• Especially denotes a heterocycle fused to benzene.

Chemistry: a divalent radical C6H4 from benzene by loss of two adjacent hydrogens.

• Sometimes used loosely in place of the phenyl group.