segmentation 音标拼音: [s
, ɛgmənt'eʃən]
n . 分割,割断,细胞分裂
分割,割断,细胞分裂
segmentation 分段
segmentation 分段
segmentation n 1 : (
embryology )
the repeated division of a fertilised ovum [
synonym : {
cleavage }, {
segmentation }]
2 :
the act of dividing or partitioning ;
separation by the creation of a boundary that divides or keeps apart [
synonym :
{
division }, {
partition }, {
partitioning }, {
segmentation },
{
sectionalization }, {
sectionalisation }]
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 .
[
1913 Webster ]
{
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 }.
[
1913 Webster ]
46 Moby Thesaurus words for "
segmentation ":
abstraction ,
alienation ,
analysis ,
analyzation ,
anatomizing ,
anatomy ,
assay ,
assaying ,
breakdown ,
breaking down ,
breaking up ,
breakup ,
detachment ,
disarticulation ,
disassociation ,
disconnectedness ,
disconnection ,
discontinuity ,
disengagement ,
disjointing ,
disjunction ,
dislocation ,
dissection ,
disunion ,
division ,
divorce ,
divorcement ,
docimasy ,
gravimetric analysis ,
incoherence ,
isolation ,
luxation ,
parting ,
partition ,
proximate analysis ,
quantitative analysis ,
reduction to elements ,
removal ,
resolution ,
semimicroanalysis ,
separation ,
separatism ,
subdivision ,
subtraction ,
withdrawal ,
zoning
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