Liberal Dictionary English Dictionary
noun Optics.
- a network of fine lines, wires, or the like placed in the focus of the eyepiece of an optical instrument.
noun
- 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
1650s, from Latin reticulum “little net,” diminutive of rete “net” (see reticulate (adj.)).