polar 音标拼音: [p'olɚ]
a . 两极的,极地的,南辕北辙的,南极的,北极的,极性的
n . 极线,极面
两极的,极地的,南辕北辙的,南极的,北极的,极性的极线,极面
polar 极化式;极的;极性的
polar 极
polar adj 1 :
having a pair of equal and opposite charges 2 :
characterized by opposite extremes ;
completely opposed ; "
in diametric contradiction to his claims "; "
diametrical (
or opposite )
points of view "; "
opposite meanings "; "
extreme and indefensible polar positions " [
synonym : {
diametric },
{
diametrical }, {
opposite }, {
polar }]
3 :
located at or near or coming from the earth '
s poles ; "
polar diameter "; "
polar zone "; "
a polar air mass "; "
Antarctica is the only polar continent "
4 :
of or existing at or near a geographical pole or within the Arctic or Antarctic Circles ; "
polar regions " [
ant :
{
equatorial }]
5 :
extremely cold ; "
an arctic climate "; "
a frigid day "; "
gelid waters of the North Atlantic "; "
glacial winds "; "
icy hands ";
"
polar weather " [
synonym : {
arctic }, {
frigid }, {
gelid }, {
glacial },
{
icy }, {
polar }]
6 :
being of crucial importance ; "
a pivotal event "; "
Its pivotal location has also exposed it to periodic invasions "-
Henry Kissinger ; "
the polar events of this study "; "
a polar principal " [
synonym : {
pivotal }, {
polar }]
Polar \
Po "
lar \,
a . [
Cf .
F .
polaire .
See {
Pole }
of the earth .]
1 .
Of or pertaining to one of the poles of the earth ,
or of a sphere ;
situated near ,
or proceeding from ,
one of the poles ;
as ,
polar regions ;
polar seas ;
polar winds .
[
1913 Webster ]
2 .
Of or pertaining to the magnetic pole ,
or to the point to which the magnetic needle is directed .
[
1913 Webster ]
3 . (
Geom .)
Pertaining to ,
reckoned from ,
or having a common radiating point ;
as ,
polar coordinates .
[
1913 Webster ]
{
Polar axis },
that axis of an astronomical instrument ,
as an equatorial ,
which is parallel to the earths axis .
{
Polar bear } (
Zool .),
a large bear ({
Ursus maritimus }
syn .
{
Thalarctos maritimus })
inhabiting the arctic regions .
It sometimes measures nearly nine feet in length and weighs 1 ,
600 pounds .
It is partially amphibious ,
very powerful ,
and the most carnivorous of all the bears .
The fur is white ,
tinged with yellow .
Called also {
White bear }.
See {
Bear }.
{
Polar body }, {
Polar cell },
or {
Polar globule } (
Biol .),
a minute cell which separates by karyokinesis from the ovum during its maturation .
In the maturation of ordinary ova two polar bodies are formed ,
but in parthogenetic ova only one .
The first polar body formed is usually larger than the second one ,
and often divides into two after its separation from the ovum .
Each of the polar bodies removes maternal chromatin from the ovum to make room for the chromatin of the fertilizing spermatozoon ;
but their functions are not fully understood .
{
Polar circles } (
Astron . &
Geog .),
two circles ,
each at a distance from a pole of the earth equal to the obliquity of the ecliptic ,
or about 23 [
deg ]
28 ',
the northern called the arctic circle ,
and the southern the antarctic circle .
{
Polar clock },
a tube ,
containing a polarizing apparatus ,
turning on an axis parallel to that of the earth ,
and indicating the hour of the day on an hour circle ,
by being turned toward the plane of maximum polarization of the light of the sky ,
which is always 90 [
deg ]
from the sun .
{
Polar coordinates }.
See under 3d {
Coordinate }.
{
Polar dial },
a dial whose plane is parallel to a great circle passing through the poles of the earth . --
Math .
Dict .
{
Polar distance },
the angular distance of any point on a sphere from one of its poles ,
particularly of a heavenly body from the north pole of the heavens .
{
Polar equation of a line }
or {
Polar equation of a surface },
an equation which expresses the relation between the polar coordinates of every point of the line or surface .
{
Polar forces } (
Physics ),
forces that are developed and act in pairs ,
with opposite tendencies or properties in the two elements ,
as magnetism ,
electricity ,
etc .
{
Polar hare } (
Zool .),
a large hare of Arctic America ({
Lepus arcticus }),
which turns pure white in winter .
It is probably a variety of the common European hare ({
Lepus timidus }).
{
Polar lights },
the aurora borealis or australis .
{
Polar opposition },
or {
Polaric opposition }
or {
Polar contrast }
or {
Polaric contrast } (
Logic ),
an opposition or contrast made by the existence of two opposite conceptions which are the extremes in a species ,
as white and black in colors ;
hence ,
as great an opposition or contrast as possible .
{
Polar projection }.
See under {
Projection }.
{
Polar spherical triangle } (
Spherics ),
a spherical triangle whose three angular points are poles of the sides of a given triangle .
See 4th {
Pole },
2 .
{
Polar whale } (
Zool .),
the right whale ,
or bowhead .
See {
Whale }.
[
1913 Webster ]
Polar \
Po "
lar \,
n . (
Conic Sections )
The right line drawn through the two points of contact of the two tangents drawn from a given point to a given conic section .
The given point is called the pole of the line .
If the given point lies within the curve so that the two tangents become imaginary ,
there is still a real polar line which does not meet the curve ,
but which possesses other properties of the polar .
Thus the focus and directrix are pole and polar .
There are also poles and polar curves to curves of higher degree than the second ,
and poles and polar planes to surfaces of the second degree .
[
1913 Webster ]
57 Moby Thesaurus words for "
polar ":
Antarctic ,
Arctic ,
Siberian ,
antagonistic ,
antipodal ,
antipodean ,
antithetic ,
antithetical ,
boundary ,
brumal ,
caudal ,
conclusive ,
confronting ,
contradictory ,
contrapositive ,
contrary ,
converse ,
counter ,
definitive ,
determinative ,
diamagnetic ,
diametric ,
electromagnetic ,
endmost ,
eventual ,
extreme ,
eyeball -
to -
eyeball ,
facing ,
farthest ,
ferromagnetic ,
final ,
freezing ,
frigid ,
frozen ,
glacial ,
hibernal ,
hostile ,
hyperborean ,
icy ,
inverse ,
last ,
limiting ,
magnetic ,
numbing ,
obverse ,
opposed ,
opposing ,
opposite ,
polaric ,
polarized ,
reverse ,
tail ,
terminal ,
terminating ,
terminative ,
ultimate ,
wintry
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