nucleus 音标拼音: [n'ukliəs]
n . 核心,核子,原子核,中坚
核心,核子,原子核,中坚
nucleus 核( 心 ); 核心; 核心程序; 核
nucleus 核心
nucleus n 1 :
a part of the cell containing DNA and RNA and responsible for growth and reproduction [
synonym : {
nucleus }, {
cell nucleus }, {
karyon }]
2 :
the positively charged dense center of an atom 3 :
a small group of indispensable persons or things ; "
five periodicals make up the core of their publishing program "
[
synonym : {
core }, {
nucleus }, {
core group }]
4 : (
astronomy )
the center of the head of a comet ;
consists of small solid particles of ice and frozen gas that vaporizes on approaching the sun to form the coma and tail 5 :
any histologically identifiable mass of neural cell bodies in the brain or spinal cord 6 :
the central structure of the lens that is surrounded by the cortex [
synonym : {
lens nucleus }, {
nucleus }]
Nucleus \
Nu "
cle *
us \,
n .;
pl .
E . {
Nucleuses },
L . {
Nuclei }. [
L .,
a kernel ,
dim .
fr .
nux ,
nucis ,
nut .
Cf . {
Newel }
post .]
[
1913 Webster ]
1 .
A kernel ;
hence ,
a central mass or point about which matter is gathered ,
or to which accretion is made ;
the central or material portion ; --
used both literally and figuratively .
[
1913 Webster ]
It must contain within itself a nucleus of truth .
--
I .
Taylor .
[
1913 Webster ]
2 . (
Astron .)
The body or the head of a comet .
[
1913 Webster ]
3 . (
Bot .)
(
a )
An incipient ovule of soft cellular tissue .
(
b )
A whole seed ,
as contained within the seed coats .
[
1913 Webster ]
4 . (
Biol .)
A body ,
usually spheroidal ,
in a eukaryotic cell ,
distinguished from the surrounding protoplasm by a difference in refrangibility and in behavior towards chemical reagents ,
which contains the chromosomal genetic material ,
including the chromosomal DNA .
It is more or less protoplasmic ,
and consists of a clear fluid (
achromatin )
through which extends a network of fibers (
chromatin )
in which may be suspended a second rounded body ,
the nucleolus (
see {
Nucleoplasm }).
See {
Cell division },
under {
Division }.
[
1913 Webster PJC ]
Note :
The nucleus is sometimes termed the endoplast or endoblast ,
and in the protozoa is supposed to be concerned in the female part of the reproductive process .
See {
Karyokinesis }.
[
1913 Webster ]
5 . (
Zool .)
(
a )
The tip ,
or earliest part ,
of a univalve or bivalve shell .
(
b )
The central part around which additional growths are added ,
as of an operculum .
(
c )
A visceral mass ,
containing the stomach and other organs ,
in Tunicata and some mollusks .
[
1913 Webster ]
112 Moby Thesaurus words for "
nucleus ":
Anlage ,
Kern ,
NMR ,
alpha particle ,
antibaryon ,
antilepton ,
antimeson ,
atomic nucleus ,
atomic particle ,
axiom ,
axis ,
baryon ,
basichromatin ,
beta particle ,
bud ,
center ,
center of action ,
center of gravity ,
centroid ,
centrum ,
chromatin ,
chromatin strands ,
core ,
dead center ,
diameter ,
diaphragm ,
egg ,
electron ,
elementary particle ,
elixir ,
embryo ,
epicenter ,
equator ,
essence ,
essential ,
flower ,
focus ,
fundamental ,
germ ,
germen ,
gist ,
gravamen ,
heart ,
heterochromatin ,
hub ,
hypostasis ,
inner essence ,
interior ,
karyosome ,
karyotin ,
kernel ,
lepton ,
loins ,
macronucleus ,
marrow ,
mean ,
meat ,
median ,
medulla ,
meganucleus ,
meson ,
metacenter ,
micronucleus ,
middle ,
midmost ,
midriff ,
midst ,
nave ,
navel ,
neutron ,
nub ,
nuclear force ,
nuclear magnetic resonance ,
nuclear particle ,
nuclear resonance ,
nucleolus ,
nucleon ,
nucleosynthesis ,
nuts and bolts ,
omphalos ,
ovum ,
photon ,
pith ,
pivot ,
plasmosome ,
postulate ,
principle ,
proton ,
quid ,
quiddity ,
quintessence ,
rudiment ,
sap ,
seed ,
soul ,
spark ,
spermatozoon ,
spirit ,
storm center ,
strangeness ,
strong interaction ,
stuff ,
substance ,
the nitty -
gritty ,
thick ,
thick of things ,
triton ,
umbilicus ,
valence electron ,
waist ,
waistline ,
zone
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