crosshairs Syllabification: (cross·hairs)Pronunciation: /ˈkrôsˌhe(ə)rz/Definition of crosshairs noun a pair of fine wires or lines crossing at right angles at the focus of an optical instrument or gun sight, for use in positioning, aiming, or measuring. a representation of crosshairs on a computer screen. crosshairs in other Oxford dictionaries Definition of crosshairs in the British & World English dictionary