NOUN (2)

1. a long narrow (nearly landlocked) cove in Ireland;

2. Irish word for a lake;

The Collaborative International Dictionary of English v.0.48:

Lough \Lough\, n. [See 1st Loch.]
   A loch or lake; -- so spelt in Ireland.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Lough \Lough\, obs. strong imp.
   of Laugh. --Chaucer.
   [1913 Webster]