Definition of "eight-square" [eight-square]

• Having eight corners; octagonal.
• An octagon or an octagonal solid. (noun)
• To make octagonal.

The Century Dictionary (Public Domain)

• "It includes graduations in hundredths, thirty-seconds, sixteenths, twelfths, tenths, and eighths of an inch, also a brace-measure, an eight-square measure, and the Essex board-measure."
• "In chamfering a four-square stick into an eight-square, the piece may be gripped in the vise diagonally, Fig. 273, or it may be held in a trough made of two strips of wood from each of which an arris has been chamfered and then the two nailed together, Fig. 274."
• "Lancaster seeks to annex an eight-square mile area near Lancaster Municipal Airport."