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2 definitions found
 for Diagonal cleavage
From The Collaborative International Dictionary of English v.0.48 :

  Diagonal \Di*ag"o*nal\, a. [L. diagonalis, fr. Gr. ? from to
     angle; dia` through + ? an angle; perh. akin to E. knee: cf.
     F. diagonal.] (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.
     [1913 Webster]
  
     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[deg] 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.
        [1913 Webster]

From The Collaborative International Dictionary of English v.0.48 :

  Cleavage \Cleav"age\, n.
     1. The act of cleaving or splitting.
        [1913 Webster]
  
     2. (Crystallog.) The quality possessed by many crystallized
        substances of splitting readily in one or more definite
        directions, in which the cohesive attraction is a minimum,
        affording more or less smooth surfaces; the direction of
        the dividing plane; a fragment obtained by cleaving, as of
        a diamond. See Parting.
        [1913 Webster]
  
     3. (Geol.) Division into lamin[ae], like slate, with the
        lamination not necessarily parallel to the plane of
        deposition; -- usually produced by pressure.
        [1913 Webster]
  
     Basal cleavage, cleavage parallel to the base of a crystal,
        or to the plane of the lateral axes.
  
     Cell cleavage (Biol.), multiplication of cells by fission.
        See Segmentation.
  
     Cubic cleavage, cleavage parallel to the faces of a cube.
        
  
     Diagonal cleavage, cleavage parallel to ta diagonal plane.
        
  
     Egg clavage. (Biol.) See Segmentation.
  
     Lateral cleavage, cleavage parallel to the lateral planes.
        
  
     Octahedral cleavage, Dodecahedral cleavage, or
     Rhombohedral cleavage, cleavage parallel to the faces of an
        octahedron, dodecahedron, or rhombohedron.
  
     Prismatic cleavage, cleavage parallel to a vertical prism.
        [1913 Webster]

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