diagonal
UK: daɪˈæɡənəl | US: daɪˈæɡənəl
adj. connecting two nonadjacent corners of a polygon or polyhedron
n. a straight line connecting two nonadjacent corners of a polygon or polyhedron
The word "diagonal" originates from Greek "diagonios," combining "dia-" (across) and "gonia" (angle). The morpheme "gon" reflects the geometric concept of angles, while "dia-" emphasizes the crossing nature of the line. The suffix "-al" adapts it into an adjective in English. Historically, it described lines cutting across corners in polygons, retaining this precise mathematical meaning today.
The diagonal line divides the square into two equal triangles.
She drew a diagonal from one corner of the rectangle to the opposite corner.
The room's diagonal measurement was longer than any single wall.
Fold the paper along the diagonal to create a triangle.
The carpenter marked a diagonal cut on the wooden plank.