Found 2 items, similar to Polar circles.
English → English
Definition: polar circle
n : a line of latitude at the north or south poles
English → English
Definition: Polar circles
, 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.
2. Of or pertaining to the magnetic pole, or to the point to
which the magnetic needle is directed.
3. (Geom.) Pertaining to, reckoned from, or having a common
radiating point; as, polar co["o]rdinates.
, that axis of an astronomical instrument, as an
equatorial, which is parallel to the earths axis.
(Zo["o]l.), a large bear (Ursus 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
, Polar cell
, or Polar globule
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 spermatozo["o]n; but their
functions are not fully understood.
(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.
, 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.
. See under 3d Co["o]rdinate
, a dial whose plane is parallel to a great
circle passing through the poles of the earth. --Math.
, 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
co["o]rdinates of every point of the line or surface.
(Physics), forces that are developed and act
in pairs, with opposite tendencies or properties in the
two elements, as magnetism, electricity, etc.
(Zo["o]l.), a large hare of Arctic America
), which turns pure white in winter. It
is probably a variety of the common European hare (Lepus timidus
, the aurora borealis or australis.
, 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
. 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
(Zo["o]l.), the right whale, or bowhead. See