Webster's English Dictionary

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balkline

balk.line \'bo.-.kli-n\ n 1: a line across a billiard table near one end 
   behind which the cue balls a re placed in making opening shots 2a: one of 
   four lines parallel to the cushions of a billiard table dividing  it into 
   nine compartments 2b: a carom billiards game that sets restrictions 
   determined by these lines