The Collaborative International Dictionary of English v.0.48:

Lochaber ax \Loch*a"ber ax"\, Lochaber axe \Loch*a"ber axe"\ n.
   [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.
   [1913 Webster]