S: (n) straight line (a line traced by a point traveling in a constant direction; a line of zero curvature) "the shortest distance between two points is a straight line"
S: (n) diagonal ((geometry) a straight line connecting any two vertices of a polygon that are not adjacent)
S: (n) diagonal, bias (a line or cut across a fabric that is not at right angles to a side of the fabric)
S: (n) diagonal (an oblique line of squares of the same color on a checkerboard) "the bishop moves on the diagonals"
S: (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)
S: (adj) diagonal (connecting 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"