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reticle

[ret-i-kuh l]
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noun Optics.
  1. a network of fine lines, wires, or the like placed in the focus of the eyepiece of an optical instrument.
Also reticule.

Origin of reticle

1650–60; < Latin rēticulum little net, equivalent to rēt- (stem of rēte) net + -i- -i- + -culum -cle1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for reticle

reticle

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 observationAlso called: graticule

Word Origin

C17: from Latin rēticulum a little net, from rēte net
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for reticle

n.

1650s, from Latin reticulum "little net," diminutive of rete "net" (see reticulate (adj.)).

Online Etymology Dictionary, © 2010 Douglas Harper