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chalaza

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chalaza


  2  definitions  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Chalaza  \Cha*la"za\,  n.;  pl  E.  {Chalazas},  L.  {Chalaz[ae]}. 
  [NL.,  fr  Gr  ?  hail,  pimple.] 
  1.  (Bot.)  The  place  on  an  ovule,  or  seed,  where  its  outer 
  coats  cohere  with  each  other  and  the  nucleus. 
 
  2.  (Biol.)  A  spiral  band  of  thickened  albuminous  substance 
  which  exists  in  the  white  of  the  bird's  egg,  and  serves  to 
  maintain  the  yolk  in  its  position;  the  treadle. 
 
  From  WordNet  r  1.6  [wn]: 
 
  chalaza 
  n  1:  basal  part  of  a  plant  ovule  opposite  the  micropyle;  where 
  integument  and  nucellus  are  joined 
  2:  one  of  two  spiral  bands  of  tissue  connecting  the  egg  yolk  to 
  the  enclosing  membrane  at  either  end  of  the  shell 




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