Definition of reticle in US English:



  • A series of fine lines or fibers in the eyepiece of an optical device, such as a telescope or microscope, or on the screen of an oscilloscope, used as a measuring scale or an aid in locating objects.

    • ‘Even autocollimators with micrometer-driven reticles used with averaged multiple readings require a skilled operator to achieve accurate, repeatable results.’
    • ‘Several different reticles are available that are tailored to the type of long range shooting envisioned.’
    • ‘In fact, the extremely complex reticles that will be required to extend optical lithography below 100 nm will make the cost of ownership impractical for low-volume applications.’
    • ‘The rifle sent forth an azure beam of energy that pierced the hologram cleanly where the reticle had been; the target disappeared and registered a hit.’
    • ‘With the default set up, your vehicle will align itself to manoeuvre to wherever you aim the targeting reticle with the mouse, while the keyboard controls forward and reverse propulsion.’


Mid 18th century: from Latin reticulum ‘net’.