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.
one of the marks that aid in the positioning of overlaying images for correct registration in printing.: Compare register (def. 11b).
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use cross hair in a sentence
After the cross-hair indicators and the level have been attached to the camera, adjustments are necessary.
If not, the difference, or "error," is found between the two vertical distances from the cross hair to the two stake tops.
All that remains is to make the horizontal cross hair parallel with the cross level.
The "radius of measurement" is the distance between the front face of the revolving mirror and the cross-hair of the micrometer.Experimental Determination of the Velocity of Light | Albert A. Michelson
Then the screw was turned till the cross-hair bisected the deflected image of the slit.Experimental Determination of the Velocity of Light | Albert A. Michelson