Definify.com
Webster 1913 Edition
Cleavage
Cleav′age
,Noun.
1.
The act of cleaving or splitting.
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
. 3.
(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 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.
Webster 1828 Edition
Cleavage
CLEAVAGE
, n.1.
The act of cleaving or splitting.2.
In mineralogy, the manner of cleaving, or of mechanical division. It is used in relation to the fracture of minerals which have natural joints and possess a regular structure.