Cell cleavage
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]


The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • 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,… …   The Collaborative International Dictionary of English

  • Cleavage (embryo) — In embryology, cleavage is the division of cells in the early embryo. The zygotes of many species undergo rapid cell cycles with no significant growth, producing a cluster of cells the same size as the original zygote. The different cells derived …   Wikipedia

  • Cleavage stimulation factor — Cleavage stimulatory factor or cleavage stimulation factor (CstF or CStF) is a heterotrimeric protein of about 200 kilodaltons that is involved in the cleavage of the 3 signaling region from a newly synthesized pre messenger RNA (mRNA) molecule.… …   Wikipedia

  • Cleavage stimulatory factor — or cleavage stimulation factor (CstF or CStF) is a heterotrimeric protein of about 200 kilodaltons that is involved in the cleavage of the 3 signaling region from a newly synthesized pre messenger RNA (mRNA) molecule. CstF is recruited by… …   Wikipedia

  • Cell fate determination — is the programming of a cell to follow a specified path of cell differentiation. Often, cells are discussed in terms of their terminal differentiation state. During development, fates of some few cells may be specified at certain times. When… …   Wikipedia

  • Cleavage — may refer to: Cleavage (breasts), partial exposure of the separation between a woman s breasts. Cleavage enhancement, methods of making a person s breast cleavage look more substantial than it really is. Buttock cleavage, minor exposure of the… …   Wikipedia

  • Cleavage and polyadenylation specificity factor — (CPSF) (or Cleavage polyadenylation stimulating factor) is involved in the cleavage of the 3 signaling region from a newly synthesized pre messenger RNA (pre mRNA) molecule in the process of gene transcription. It is the first protein to bind to… …   Wikipedia

  • Cleavage factor — Cleavage factors are two closely related proteins involved in the cleavage of the 3 signaling region from a newly synthesized pre messenger RNA (mRNA) molecule in the process of gene transcription. The cleavage is the first step in adding a… …   Wikipedia

  • cleavage cell — n BLASTOMERE * * * blastomere …   Medical dictionary

  • cleavage — ► NOUN 1) a sharp division; a split. 2) the cleft between a woman s breasts. 3) Biology cell division, especially of a fertilized egg cell. 4) the splitting of rocks or crystals in a preferred plane or direction …   English terms dictionary

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