reticle

UK: /ˈrɛtɪk^əl/ US: (ret′i kəl)

WordReference Random House Unabridged Dictionary of American English © 2025

ret•i•cle  (ret′i kəl), n. [Optics.]

1. Optics a network of fine lines, wires, or the like placed in the focus of the eyepiece of an optical instrument. Also, reticule. 

• Latin rēticulum little net, equivalent. to rēt- (stem of rēte) net + -i- -i- + -culum -cle¹
• 1650–60

Collins Concise English Dictionary © HarperCollins Publishers::

reticle / ˈrɛtɪk^əl/, (less commonly)reticule noun

1. a network of fine lines, wires, etc, placed in the focal plane of an optical instrument to assist measurement of the size or position of objects under observation

Etymology: 17th Century: from Latin rēticulum a little net, from rēte net