n. A machine used in France for beheading condemned persons by the action of a heavily weighted, oblique-edged knife falling between two grooved posts upon the neck of the victim, whose head protrudes through a circular hole in a divided plank.n. One of several machines similar in principle to the above, much used for cutting paper, straw, etc. Also called guillotine cutter.n. In surgery, an instrument for cutting the tonsils.To behead by the guillotine.n. A machine for breaking iron by means of a falling weight.