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cross hair

or crosshair

noun

  1. 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.
  2. one of the marks that aid in the positioning of overlaying images for correct registration in printing. Compare register ( def 11b ).


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Word History and Origins

Origin of cross hair1

First recorded in 1880–85
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Example Sentences

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.

Then the screw was turned till the cross-hair bisected the deflected image of the slit.

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cross-grainedcross hairs