Open English Wordnet
Nouns
(n)diagonal(geometry) a straight line connecting any two vertices of a polygon that are not adjacent (n)diagonal, biasa line or cut across a fabric that is not at right angles to a side of the fabric (n)diagonalan oblique line of squares of the same color on a checkerboard“the bishop moves on the diagonals” (n)diagonal(mathematics) a set of entries in a square matrix running diagonally either from the upper left to lower right entry or running from the upper right to lower left entry Adjectives
(s)diagonalconnecting two nonadjacent corners of a plane figure or any two corners of a solid that are not in the same face“a diagonal line across the page”