crosshair


cross hair

or cross·hair (krôs′hâr′, krŏs′-)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.

crosshair

(ˈkrɒsˌhɛə) n (General Engineering) either of the two fine mutually perpendicular lines or wires that cross in the focal plane of a theodolite, gunsight, or other optical instrument and are used to define the line of sight. Also called: crosswire