cross hair

cross hair or cross·hair (krôshâr, krs-)

n.

Either of two fine strands of wire crossed in the focus of the eyepiece of an optical instrument and used as a calibration or sighting reference.

Thesaurus

Noun

1.

cross hair - either of two fine mutually perpendicular lines that cross in the focus plane of an optical instrument and are use for sighting or calibration; "he had the target in his cross hairs" cross wire graticule, reticle, reticule - a network of fine lines, dots, cross hairs, or wires in the focal plane of the eyepiece of an optical instrument line - a mark that is long relative to its width; "He drew a line on the chart"