Arlberg

Arlberg, a mountain mass between the Austrian provinces of Vorarlberg and Tyrol, pierced by a tunnel, one of the three that penetrate the Alps, and nearly four miles in length.

Definition taken from The Nuttall Encyclopædia, edited by the Reverend James Wood (1907)

Arkwright, Sir Richard * Arles
[wait for the fun]
Aristode`mus
Aristom`enes
Aristophanes
Ar`istotle
Aristox`enus of Tarentum
A`rius
Arizo`na
Ark of the Covenant
Arkans`as
Arkwright, Sir Richard
Arlberg
Arles
Ar`lincourt, Viscount d'
Ar`lington, Henry Bennet, Earl of
Ar`lon
Arma`da
Armageddon
Armagh
Armagnac
Armagnacs
Armato`les