Source : Webster's Revised Unabridged Dictionary (1913)

Lochaber ax \Loch*a"ber ax"\, Lochaber axe \Loch*a"ber axe"\ .
   [So called from Lochaber, in Scotland.]
   A weapon of war, consisting of a pole armed with an axhead at
   its end, formerly used by the Scotch Highlanders.

Source : WordNet®

Lochaber ax
     n : a battle-ax formerly used by Scottish Highlanders