graticule vs plexus

graticule

noun
  • A nearly square or nearly rectangular region created by a graticule. 

  • A reticle. 

  • A grid of horizontal and vertical lines. 

  • The network of lines of latitude and longitude that make up a coordinate system such as the one used for the Earth. 

plexus

noun
  • An interwoven combination of parts or elements in a structure or system. 

  • The system of equations required for the complete expression of the relations which exist between a set of quantities. 

  • A network of anastomosing or interwoven nerves, blood vessels, or lymphatic vessels. 

How often have the words graticule and plexus occurred in a corpus of books? (source: Google Ngram Viewer )