cross wire

Noun
  1. Either of two fine mutually perpendicular lines that cross in the focus plane of an optical instrument and are use for sighting or calibration (synset 103141424)
    "he had the target in his cross hairs"
    is a type of: line - a mark that is long relative to its width
    is a part of: graticule, reticle, reticule - a network of fine lines, dots, cross hairs, or wires in the focal plane of the eyepiece of an optical instrument
    same as: cross hair

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