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cross hair

or cross·hair

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noun Usually cross hairs.
  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).
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for cross hair

Historical Examples

  • 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.

  • After the cross-hair indicators and the level have been attached to the camera, adjustments are necessary.