corpuscle
n . 微粒子;血球;原子;电子
微粒子;血球;原子;电子
corpuscle 粒子
corpuscle n 1 : (
nontechnical usage )
a tiny piece of anything [
synonym : {
atom },
{
molecule }, {
particle }, {
corpuscle }, {
mote }, {
speck }]
2 :
either of two types of cells (
erythrocytes and leukocytes )
and sometimes including platelets [
synonym : {
blood cell }, {
blood corpuscle }, {
corpuscle }]
Corpuscle \
Cor "
pus *
cle \ (-
p [
u ^]
s *
s '
l ),
n . [
L .
corpusculum ,
dim .
of corpus .]
1 .
A minute particle ;
an atom ;
a molecule .
[
1913 Webster ]
2 . (
Anat .)
A protoplasmic animal cell ;
esp .,
such as float free ,
like blood ,
lymph ,
and pus corpuscles ;
or such as are imbedded in an intercellular matrix ,
like connective tissue and cartilage corpuscles .
See {
Blood }.
[
1913 Webster ]
Virchow showed that the corpuscles of bone are homologous with those of connective tissue .
--
Quain '
s Anat .
[
1913 Webster ]
3 . (
Physics )
An electron . [
archaic ]
[
Webster 1913 Suppl .]
{
Red blood corpuscles } (
Physiol .),
in man ,
yellowish ,
biconcave ,
circular discs varying from 1 /
3500 to 1 /
3200 of an inch in diameter and about 1 /
12400 of an inch thick .
They are composed of a colorless stroma filled in with semifluid h [
ae ]
moglobin and other matters .
In most mammals the red corpuscles are circular ,
but in the camels ,
birds ,
reptiles ,
and the lower vertebrates generally ,
they are oval ,
and sometimes more or less spherical in form .
In Amphioxus ,
and most invertebrates ,
the blood corpuscles are all white or colorless .
{
White blood corpuscles } (
Physiol .),
rounded ,
slightly flattened ,
nucleated cells ,
mainly protoplasmic in composition ,
and possessed of contractile power .
In man ,
the average size is about 1 /
2500 of an inch ,
and they are present in blood in much smaller numbers than the red corpuscles .
[
1913 Webster ]
Electron \
E *
lec "
tron \,
n . [
NL .,
fr .
Gr . '
h `
lektron .
See {
Electric }.]
1 .
Amber ;
also ,
the alloy of gold and silver ,
called {
electrum }. [
archaic ]
[
1913 Webster ]
2 . (
Physics &
Chem .)
one of the fundamental subatomic particles ,
having a negative charge and about one thousandth the mass of a hydrogen atom .
The electron carries (
or is )
a natural unit of negative electricity ,
equal to 3 .
4 x 10 ^{-
10 }
electrostatic units ,
and is classed by physicists as a {
lepton }.
Its mass is practically constant at the lesser speeds ,
but increases due to relativistic effects as the velocity approaches that of light .
Electrons are all of one kind ,
so far as is known .
Thus far ,
no structure has been detected within an electron ,
and it is probably one of the ultimate composite constituents of all matter .
An atom or group of atoms from which an electron has been detached has a positive charge and is called a {
cation }.
Electrons are projected from the cathode of vacuum tubes (
including television picture tubes )
as {
cathode rays }
and from radioactive substances as the {
beta rays }.
Previously also referred to as {
corpuscle },
an obsolete term .
The motion of electrons through metallic conductors is observed as an electric current .
A particle identical to the electron in mass and most other respects ,
but having a positive instead of a negative charge ,
is called a {
positron },
or {
antielectron }
[
Webster 1913 Suppl .
PJC ]
Electro -
negative
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