The Collaborative International Dictionary of English v.0.48:

ginmill \ginmill\, gin mill \gin mill\n.
   A commercial establishment where alcoholic drinks are served
   over a counter; a barroom; -- a disparaging term suggesting a
   cheap or disreputable bar.

   Syn: barroom, bar-room, bar, saloon, taproom.
        [WordNet 1.5 +PJC]

WordNet (r) 3.0 (2006):

ginmill
    n 1: a room or establishment where alcoholic drinks are served
         over a counter; "he drowned his sorrows in whiskey at the
         bar" [syn: barroom, bar, saloon, ginmill,
         taproom]