| cross hair | | |
| n. (artifact) | 1. cross hair, cross wire | 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" |
| ~ graticule, reticle, reticule | a network of fine lines, dots, cross hairs, or wires in the focal plane of the eyepiece of an optical instrument. |
| ~ line | a mark that is long relative to its width.; "He drew a line on the chart" |
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