Navigation. a network of parallels and meridians on a map or chart.
Optics. a reticle.

1885–90; < French < Latin crāticula, diminutive of crātis. See grate2, -cule Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
graticule (ˈɡrætɪˌkjuːl)
1.  the grid of intersecting lines, esp of latitude and longitude on which a map is drawn
2.  another name for reticle
3.  a transparent scale in front of a cathode-ray oscilloscope or other measuring instrument
[C19: from French, from Latin crāticula, from crātis wickerwork]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Do not count any fiber that crosses the graticule boundary more than once.
The user must first drag a box to generate the graticule boundaries.
Images for graticule
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