Guillotine
Defined in 2 dictionaries — Bouvier (1914), Black's (1910)
Bouvier's Law Dictionary and Concise Encyclopedia
John Bouvier; revised by Francis Rawle · 1914
An apparatus for beheading criminals with a single blow, used in some countries, as France and Greece, for capital punishment. A form of it was in use in the middle ages, but, being improved by Dr. Guillotin at the time of the French Revolution, it received its present name. Cent. Diet.
Black's Law Dictionary
Henry Campbell Black, M.A. · 1910
An instrument for decapitation, used in France for the infliction of the death penalty on convicted criminals, consisting, essentially, of a heavy and weighted knife-blade moving perpendicularly between grooved posts, which is made to fall from a censiderable height upon the neck of the sufferer, immovably fixed in position to receive the impact.