Ice Hockey. either of two lines of the color blue that are parallel to and equidistant from the goal lines and divide the rink into three zones of equal size. Also called zone line. Cf. end zone (def. 2), neutral zone.
Pronunciation: (blOO'līn"),[key] —n.Print. a print made on light-sensitive paper and used as a proof for checking the position of stripped-up negatives or positives and copy prior to platemaking. Also,blue.