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umbramore about umbra

umbra

 

  4  definitions  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Ombre  \Om"bre\,  n.  [F.,  of  uncertain  origin.]  (Zo["o]l.) 
  A  large  Mediterranean  food  fish  ({Umbrina  cirrhosa}):  -- 
  called  also  {umbra},  and  {umbrine}. 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Penumbra  \Pe*num"bra\,  n.  [NL.,  fr  L.  paene  almost  +  umbra 
  shade.] 
  1.  An  incomplete  or  partial  shadow. 
 
  2.  (Astron.)  The  shadow  cast,  in  an  eclipse,  where  the  light 
  is  partly,  but  not  wholly,  cut  off  by  the  intervening 
  body;  the  space  of  partial  illumination  between  the  umbra, 
  or  perfect  shadow,  on  all  sides,  and  the  full  light.  --Sir 
  I.  Newton. 
 
  Note:  The  faint  shade  surrounding  the  dark  central  portion  of 
  a  solar  spot  is  also  called  the  {penumbra},  and 
  sometimes  {umbra}. 
 
  3.  (Paint.)  The  part  of  a  picture  where  the  shade 
  imperceptibly  blends  with  the  light. 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Umbra  \Um"bra\,  n.;  pl  {Umbr[ae]}.  [L.,  a  shadow.] 
  1.  (Astron.) 
  a  The  conical  shadow  projected  from  a  planet  or 
  satellite,  on  the  side  opposite  to  the  sun,  within 
  which  a  spectator  could  see  no  portion  of  the  sun's 
  disk;  --  used  in  contradistinction  from  penumbra.  See 
  {Penumbra}. 
  b  The  central  dark  portion,  or  nucleus,  of  a  sun  spot. 
  c  The  fainter  part  of  a  sun  spot;  --  now  more  commonly 
  called  penumbra. 
 
  2.  (Zo["o]l.)  Any  one  of  several  species  of  sci[ae]noid  food 
  fishes  of  the  genus  {Umbrina},  especially  the 
  Mediterranean  species  ({U.  cirrhosa}),  which  is  highly 
  esteemed  as  a  market  fish;  --  called  also  {ombre},  and 
  {umbrine}. 
 
  {Umbra  tree}  (Bot.),  a  tree  ({Phytolacca  diocia})  of  the  same 
  genus  as  pokeweed.  It  is  native  of  South  America,  but  is 
  now  grown  in  southern  Europe.  It  has  large  dark  leaves, 
  and  a  somber  aspect.  The  juice  of  its  berries  is  used  for 
  coloring  wine.  --J.  Smith  (Dict.  Econ.  Plants). 
 
  From  WordNet  r  1.6  [wn]: 
 
  umbra 
  n  :  a  region  of  complete  shadow  resulting  from  total  obstruction 
  of  light




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