1. (a.) 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.

2. (n.) 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.

3. (n.) A member, in a framed structure, running obliquely across a panel.

4. (n.) A diagonal cloth; a kind of cloth having diagonal stripes, ridges, or welts made in the weaving.

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