Webster's 1913 Dictionary
GRATICULE
Grat "i *cule, n. Etym: [F. See Graticulation. ]
Defn: A design or draught which has been divided into squares, in order to reproduce it in other dimensions.
New American Oxford Dictionary
graticule
grat i cule |ˈgratəˌkyo͞ol ˈɡrædəkjul | ▶noun technical a network of lines representing meridians and parallels, on which a map or plan can be represented. ORIGIN late 19th cent.: from French, from medieval Latin graticula ‘a little grating, ’ from Latin craticula ‘gridiron, ’ diminutive of cratis ‘hurdle. ’
Oxford Dictionary
graticule
graticule |ˈgratɪkjuːl | ▶noun technical a network of lines representing meridians and parallels, on which a map or plan can be represented. • a series of fine lines or fibres in the eyepiece of an optical device, such as a microscope, or on the screen of an oscilloscope, used as a measuring scale or an aid in locating objects. ORIGIN late 19th cent.: from French, from medieval Latin graticula ‘a little grating ’, from Latin craticula ‘gridiron ’, diminutive of cratis ‘hurdle ’.
The Wordsmith Dictionary