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cotyledon

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cotyledon


  2  definitions  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Cotyledon  \Cot`y*le"don\  (k?t`?-l?"d?n),  n.  [Gr.???  a  cupshaped 
  hollow,  fr  ???.  See  {Cotyle}.] 
  1.  (Anat.)  One  of  the  patches  of  villi  found  in  some  forms  of 
  placenta. 
 
  2.  (Bot.)  A  leaf  borne  by  the  caulicle  or  radicle  of  an 
  embryo;  a  seed  leaf. 
 
  Note:  Many  plants,  as  the  bean  and  the  maple,  have  two 
  cotyledons,  the  grasses  only  one  and  pines  have 
  several.  In  one  African  plant  ({Welwitschia})  the 
  cotyledons  are  permanent  and  grow  to  immense 
  proportions. 
 
  From  WordNet  r  1.6  [wn]: 
 
  cotyledon 
  n  :  embryonic  leaf  in  seed-bearing  plants  [syn:  {seed  leaf}] 




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