Cross wires Meaning, Definition & Usage
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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
cross hair; cross wire.
- he had the target in his cross hairs
WordNet
Definitions
- fine wires made to traverse the field of view in a telescope, and moved by a screw with a graduated head, used for delicate astronomical observations; spider lines. Fixed cross wires are also used in microscopes, etc.
