Meaning of SEGMENTATION
| Pronunciation: | | `segmun'teyshun
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 WordNet Dictionary |
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- [n] the act of dividing or partitioning; separation by the creation of a boundary that divides or keeps apart
- [n] (embryology) the repeated division of a fertilised ovum
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| | Synonyms: | | cleavage, division, partition, partitioning, sectionalisation, sectionalization |
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| | See Also: | | cell division, cellular division, gestation, pregnancy, separation, septation, subdivision, zoning | |
| Webster's 1913 Dictionary |
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| | Definition: | | \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
formation.
{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}.
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| Computing Dictionary |
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| | Definition: | | (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. |
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| Biology Dictionary |
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| | 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. |
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