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n. The act of cleaving or splitting.

 - (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.

 - (Geol.) Division into laminæ, like slate, with the lamination not necessarily parallel to the plane of deposition; - usually produced by pressure. 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 the diagonal plane.

 - Egg cleavage. (Biol.) See Segmentation.

 - Lateral cleavage, cleavage parallel to the lateral planes.

 - Octahedral, Dodecahedral, or Rhombohedral, cleavage, cleavage parallel to the faces of an octahedron, dodecahedron, or rhombohedron.

 - Prismatic cleavage, cleavage parallel to a vertical prism.

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