Definition of balkline
1
: a line across a billiard table near one end behind which the cue balls are placed in making opening shots
2a
: one of four lines parallel to the cushions of a billiard table dividing it into nine compartments
b
: a billiards game that sets restrictions in scoring caroms according to these lines
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Merriam-Webster unabridged
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The first known use of balkline was in 1839
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