THESAURUS
diagonal
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