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zonamore about zona

zona


  1  definition  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Zona  \Zo"na\,  n.;  pl  {Zon[ae]}.  [L.,  a  girdle.  See  {Zone}.] 
  A  zone  or  band;  a  layer. 
 
  {Zona  pellucida}.  [NL.]  (Biol.) 
  a  The  outer  transparent  layer,  or  envelope,  of  the  ovum.  It 
  is  a  more  or  less  elastic  membrane  with  radiating 
  stri[ae],  and  corresponds  to  the  cell  wall  of  an  ordinary 
  cell.  See  {Ovum},  and  Illust.  of  {Microscope}. 
  b  The  zona  radiata. 
 
  {Zona  radiata}  [NL.]  (Biol.),  a  radiately  striated  membrane 
  situated  next  the  yolk  of  an  ovum,  or  separated  from  it  by 
  a  very  delicate  membrane  only. 




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