Source : Webster's Revised Unabridged Dictionary (1913)

Guillotine \Guil"lo*tine`\ (g[i^]l`l[-o]*t[=e]n"), v. t. [imp. &
   p. p. {Guillotined}; p. pr. & vb. n. {Guillotining}.] [Cf. F.
   guillotiner.]
   To behead with the guillotine.