There are several meaning for the word "grids" such as a network of horizontal and vertical lines superimposed over a map, building plan, etc, for locating points. Another meaning is a grating consisting of parallel bars.
one grid - triodetwo grids - tetrodethree grids - pentodefour grids - hexodefive grids - heptode, pentagrid convertersix grids - octodeseven grids - nonodeetc.
the map grids are the grids that are on the map for the earth to be measured.
word squares
There is none, since there are no grids!
Archaeologists create grids because it makes it easier for them to measure where things were found, and where they have dug. Without grids it would be easy to become confused.
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The definition of the root word alti is high
a definition of a compound word is jack-ass.
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That word has no definition in English.