The pollaxe is a type of European polearm which was widely used by medieval infantry. It is also known by the names poleaxe, pole-axe, pole, polax, and Hache(French meaning axe).
The term has become synonymous with felling or striking down with delivery of a blow.
Sometimes weapons such as the halberd, the bardiche or the Danish axe are mistakenly called pollaxes as they are indeed axes mounted on poles, but many etymological authorities consider the poll- prefix historically unrelated to "pole", instead meaning "head".
There are however some etymologists, such as Eric Partridge, who do believe that the word is derived from "pole".