reticle /ˈɹɛtɪkəl/ noun2 •A transparent plate marked with a crosshair, grid, or scale which is used in an optical instrument, etc., to aid in alignment, counting, or measurement of objects being observed; also, the crosshair, grid, or scale on such a plate. •A master or template, comprising a pattern of lines and shapes, used in photolithography to create the tiny integrated circuits on a microchip. formsreticles