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polarmore about polar

polar


  3  definitions  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  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. 
 
  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. 
 
  {Polar  axis},  that  axis  of  an  astronomical  instrument,  as  an 
  equatorial,  which  is  parallel  to  the  earths  axis. 
 
  {Polar  bear}  (Zo["o]l.),  a  large  bear  ({Ursus,  or  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},  {cell},  or  {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  spermatozo["o]n;  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  co["o]rdinates}.  See  under  3d  {Co["o]rdinate}. 
 
  {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  {surface},  an  equation  which 
  expresses  the  relation  between  the  polar  co["o]rdinates  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}  (Zo["o]l.),  a  large  hare  of  Arctic  America 
  ({Lepus  arcticus}),  which  turns  pure  white  in  winter.  It 
  is  probably  a  variety  of  the  common  European  hare  ({L. 
  timidus}). 
 
  {Polar  lights},  the  aurora  borealis  or  australis. 
 
  {Polar},  or  {Polaric},  {opposition}  or  {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}  (Zo["o]l.),  the  right  whale,  or  bowhead.  See 
  {Whale}. 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  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. 
 
  From  WordNet  r  1.6  [wn]: 
 
  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"  [syn:  {diametric},  {diametrical}, 
  {opposite}] 
  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";  "let's  get  inside;  I'm 
  freezing";  "a  frigid  day";  "gelid  waters  of  the  North 
  Atlantic";  "glacial  winds";  "icy  hands";  "polar  weather" 
  [syn:  {arctic},  {freezing},  {frigid},  {gelid},  {glacial}, 
  {icy}] 
  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"  [syn:  {pivotal}] 




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