Diagonal

a.	1.	(Geom.) Joining two not adjacent angles of a quadrilateral or multilateral figure; running across from corner to corner; crossing at an angle with one of the sides. Diagonal bond (Masonry) herringbone work. See Herringbone, a. Diagonal built (Shipbuilding) built by forming the outer skin of two layers of planking, making angles of about 45° with the keel, in opposite directions. Diagonal cleavage See under Cleavage. Diagonal molding (Arch.) a chevron or zigzag molding. Diagonal rib (Arch.) See Cross-springer. Diagonal scale a scale which consists of a set of parallel lines, with other lines crossing them obliquely, so that their intersections furnish smaller subdivisions of the unit of measure than could be conveniently marked on a plain scale. Diagonal stratification (Geol.) Same as Cross bedding, under Cross, a.
n.	1.	A right line drawn from one angle to another not adjacent, of a figure of four or more sides, and dividing it into two parts.
	2.	(Engin.) A member, in a framed structure, running obliquely across a panel.
	3.	A diagonal cloth; a kind of cloth having diagonal stripes, ridges, or welts made in the weaving.

Noun	1.	diagonal - (geometry) a straight line connecting any two vertices of a polygon that are not adjacent
	2.	diagonal - a line or cut across a fabric that is not at right angles to a side of the fabric Synonyms: bias
	3.	diagonal - an oblique line of squares of the same color on a checkerboard; "the bishop moves on the diagonals"
	4.	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
	5.	diagonal - a punctuation mark (/) used to separate related items of information Synonyms: separatrix, virgule, solidus, slash, stroke
Adj.	1.	diagonal - at an angle; especially 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"
	2.	diagonal - having an oblique or slanted direction Synonyms: aslant, aslope, slanted, slanting, sloped, sloping

across, air line, athwart, axis, band, bar, beeline, bend, bendwise, bevel, beveled, bias, biased, biaswise, catercorner, catercornered, chord, cross-hatching, crossways, crosswise, dash, delineation, diameter, direct line, directrix, dotted line, edge, great-circle course, hachure, hairline, hatching, kittycorner, line, lineation, normal, oblique, oblique angle, oblique figure, oblique line, perpendicular, radius, radius vector, rhomboid, right line, score, scratch comma, secant, segment, separatrix, shortcut, side, slant, slanted, slanting, slash, solidus, straight, straight course, straight line, straight stretch, straightaway, streak, streaking, streamline, striation, strip, stripe, striping, stroke, sublineation, tangent, thwart, transversal, transverse, underline, underlining, underscore, underscoring, vector, virgule