cross hair

cross hair

noun Usually, cross hairs.
1.
Also called cross wire. one of the fine wires or fibers, strands of spider web, or the like, crossing in a focal plane of an optical instrument to center a target or object or to define a line of sight.
2.
one of the marks that aid in the positioning of overlaying images for correct registration in printing. Compare register ( def 11b ).
Also, crosshair.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
cross hair

noun
either of two fine mutually perpendicular lines that cross in the focus plane of an optical instrument and are use for sighting or calibration; "he had the target in his cross hairs" 
WordNet® 3.0, © 2006 by Princeton University.
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