Etymology
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poleax (n.)

kind of long-handled axe used as a weapon or by butchers, mid-14c., pollax, pol-axe, from pol "head" (see poll (n.)) + ax (n.). From notion of beheading or skull-splitting, or perhaps from the shape of the ax. Spelling altered 17c. by confusion with pole (n.1)).

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Definitions of poleax
1
poleax (n.)
an ax used to slaughter cattle; has a hammer opposite the blade;
Synonyms: poleaxe
poleax (n.)
a battle ax used in the Middle Ages; a long handled ax and a pick;
Synonyms: poleaxe
2
poleax (v.)
fell with or as if with a poleax;
Synonyms: poleaxe
From wordnet.princeton.edu