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segmentation - 8 dictionary results
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seg⋅men⋅ta⋅tion

  [seg-muhn-tey-shuhn]
Use segmentation in a Sentence
–noun
1. division into segments.
2. Biology.
a. the subdivision of an organism or of an organ into more or less equivalent parts.
b. cell division.
Origin:
1850–55; segment + -ation
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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cleav·age   (klē'vĭj)   
n.  
  1. The act of splitting or cleaving.
  2. The state of being split or cleft; a fissure or division.
  3. Mineralogy The splitting or tendency to split of a crystallized substance along definite crystalline planes, yielding smooth surfaces.
  4. Embryology
    1. The series of mitotic cell divisions that produces a blastula from a fertilized ovum. It is the basis of the multicellularity of complex organisms. Also called segmentation.
    2. Any single cell division in such a series.
  5. Chemistry The splitting of a complex molecule, such as a polysaccharide, into simpler molecules.
  6. Informal The hollow between a woman's breasts, especially as revealed by a low neckline.
seg·men·ta·tion   (sěg'mən-tā'shən, -měn-)   
n.  
  1. Division into segments.
  2. Embryology See cleavage.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Segmentation

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.
Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.
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segmentation

fault n. [Unix]
1. [techspeak] An error in which a running program attempts to access memory not allocated to it and core dumps with a segmentation violation error. This is often caused by improper usage of pointers in the source code, dereferencing a null pointer, or (in C) inadvertently using a non-pointer variable as a pointer. The classic example is:

int i; scanf ("%d", i); /* should have used &i */
2. To lose a train of thought or a line of reasoning. Also uttered as an exclamation at the point of befuddlement.
Jargon File 4.2.0
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Main Entry: seg·men·ta·tion
Pronunciation: "seg-(")men-'tA-sh&n
Function: noun
1 : the act or process of dividing intosegments; especially : the formation of many cells from a single cell (as in a developing egg)
2 : annular contraction of smooth muscle (as of the intestine) thatseems to cut the part affected into segments —compare PERISTALSIS
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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segmentation seg·men·ta·tion (sěg'mən-tā'shən, -měn-)
n.
See cleavage.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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segmentation networking
(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.
[Better reasons?]
(1999-06-14)

The Free On-line Dictionary of Computing, © 1993-2007 Denis Howe
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