crosswire

cross wire

noun Optics.
cross hair ( def 1 ).
Also, crosswire.
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WordNet
cross wire

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" [syn: cross hair
WordNet® 3.0, © 2006 by Princeton University.
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