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Pronunciation:  `segmun'teyshun

WordNet Dictionary
  1. [n]  the act of dividing or partitioning; separation by the creation of a boundary that divides or keeps apart
  2. [n]  (embryology) the repeated division of a fertilised ovum

SEGMENTATION is a 12 letter word that starts with S.


 Synonyms: cleavage, division, partition, partitioning, sectionalisation, sectionalization
 See Also: cell division, cellular division, gestation, pregnancy, separation, septation, subdivision, zoning



Webster's 1913 Dictionary
\Seg`men*ta"tion\, n.
The act or process of dividing into segments; specifically
(Biol.), a self-division into segments as a result of growth;
cell cleavage; cell multiplication; endogenous cell

{Segmentation cavity} (Biol.), the cavity formed by the
   arrangement of the cells in segmentation or cleavage of
   the ovum; the cavity of the blastosphere. In the gastrula
   stage, the segmentation cavity in which the mesoblast is
   formed lies between the entoblast and ectoblast. See
   Illust. of {Invagination}.

{Segmentation nucleus} (Biol.), the body formed by fusion of
   the male and female pronucleus in an impregnated ovum. See
   the Note under {Pronucleus}.

{Segmentation of the ovum}, or {Egg cleavage} (Biol.), the
   process by which the embryos of all the higher plants and
   animals are derived from the germ cell. In the simplest
   case, that of small ova destitute of food yolk, the ovum
   or egg divides into two similar halves or segments
   (blastomeres), each of these again divides into two, and
   so on, thus giving rise to a mass of cells (mulberry mass,
   or morula), all equal and similar, from the growth and
   development of which the future animal is to be formed.
   This constitutes regular segmentation. Quite frequently,
   however, the equality and regularity of cleavage is
   interfered with by the presence of food yolk, from which
   results unequal segmentation. See {Holoblastic},
   {Meroblastic}, {Alecithal}, {Centrolecithal},
   {Ectolecithal}, and {Ovum}.

{Segmentation sphere} (Biol.), the blastosphere, or morula.
   See {Morula}.

Computing Dictionary

(Or "segmentation and reassembly", SAR) Breaking an arbitrary size packet into smaller pieces at the transmitter. This may be necessary because of restrictions in the communications channel or to reduce latency. The pieces are joined back together in the right order at the receiver ("reassembly"). Segmentation may be performed by a router when routing a packet to a network with a smaller maximum packet size.

The term "segmentation" is used in atm, in tcp/ip, it is called "fragmentation" an is performed at the ip layer before the "fragments" are passed to the transport layer.

See for example atm forum uni 4.0 specification.

Biology Dictionary
 Definition: A development pattern of the embryo of the fruit fly <EM>Drosophila</EM> where the embryo looks like a stack of discs. Each disc is a segment, and each segment consists of two compartments (an anterior and posterior). Various parts of the adult fruit fly (wings, legs, eyes, etc.) arise from specific segments.