WordNet
cross hair
n. 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" [syn: cross wire]
Usage examples of "cross hair".
The scope was equipped with its own range-finding system, a multiple mounting of graduated dots on the vertical cross hair for various ranges, and was sighted in at five hundred yards.