beheader

verb (used with object)

1. to cut off the head of; kill or execute by decapitation.
2. Geology. (of a pirate stream) to divert the headwaters of (a river, stream, etc.).

verb

1. (tr) to remove the head from; decapitate

v.

Old English beheafdian, from be-, here with privative force, + heafod (see head (n.)). Related: Beheaded; beheading.