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Di·ag·o·nal a. 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.