| 释义 |
cross hairs cross hairspl n1. (General Engineering) 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: cross wires cross′ hairs`
n.pl. fine wires or fibers crossing in a focal plane of an optical instrument to center an object or to define a line of sight. |