# segment

(redirected from*mesodermal segment*)

Also found in: Dictionary, Thesaurus, Medical, Financial.

## segment

**1.**

*Maths*

**a.**a part of a line or curve between two points

**b.**a part of a plane or solid figure cut off by an intersecting line, plane, or planes, esp one between a chord and an arc of a circle

**2.**

*Zoology*any of the parts into which the body or appendages of an annelid or arthropod are divided

*The Great Soviet Encyclopedia*(1979). It might be outdated or ideologically biased.

## Segment

in mathematics. A segment of a line is the set of points on the line that are located between two points *A* and *B;* in Russian usage, the segment includes both *A* and *B.* In other words, a segment is the set of points of a line such that the coordinates of the points satisfy the condition *a* ≤ *x* ≤ *b,* where *a* and *b* are the coordinates of the segment endpoints. Thus, the segment constitutes a closed interval and can be denoted by *[a, b].*

## Segment

(1)A segment in the plane is a region bounded by a chord and the arc of the curve subtended by the chord. The area of the segment *AmB* of the circle in Figure 1 is the difference between the area of the sector *OAmB* and the triangle *OAB.*

(2) A segment in space is a part cut off from a solid by a plane. An example is a spherical segment.

(3) A segment of a line is the set of points on a line that are located between two points *A* and *B.* In Russian usage, the two points *A* and *B* are included in the segment. Thus, a segment is the set of points on a line whose coordinates satisfy the condition *a*≤ *x* ≤ *b*. (*See*INTERVAL AND SEGMENT.)

## Segment

(also metamere), one of a series of homologous parts of the body of an animal, located along the long axis of the body. Segments may be similar to one another; for instance, among the most primitive annelids the entire complex of organs is repeated in each segment. Given the same general structure, complete similarity between segments may be destroyed by the absence of certain organs or by some change in the organs: these types of segments may be observed among arthropods. The segmentation of an animal’s body is also called metamerism.

## segment

[′seg·mənt]*G*is a subset

*D*of

*G*such that if

*a*is in

*D*then so are all elements

*b*satisfying -

*a*≤

*b*≤

*a*.

## segment

2. <programming> A separately relocatable section of an executable program. Unix executables have a text segment (executable machine instructions), a data segment (initialised data) and a bss segment (uninitialised data).

3. <networking> network segment.

4. To experience a segmentation fault. Confusingly, the stress is often put on the first syllable, like the noun "segment", rather than the second like mainstream verb "segment". This is because it is actually a noun shorthand that has been verbed.

5. A block of memory in a segmented address space.

**foldoc.org**)

## segment

**(1)**Any partition, reserved area, partial component or piece of a larger structure. See overlay.

**(2)**One of the bars that make up a single character in an LED or LCD display.

**(3)**For DOS segment addressing, see paragraph.

**The Computer Language Company Inc**. All Rights reserved. THIS DEFINITION IS FOR PERSONAL USE ONLY. All other reproduction is strictly prohibited without permission from the publisher.