1) Execution method 2) Means of execution 
Execution by electrocution, usually performed using an electric chair, is an execution method originating in the United States in which the condemned person is strapped to a specially built wooden chair and electrocuted through electrodes placed on the head and leg. This execution method was created by employees of Thomas Edison during the War of ...
[n] - an instrument of execution by electrocution
chair 1 death chair noun an instrument of execution by electrocution; resembles an ordinary seat for one person; `the murderer was sentenced to die in the chair`
a chair used to electrocute criminals sentenced to death. · the penalty of legal electrocution.