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operculummore about operculum

operculum


  2  definitions  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Operculum  \O*per"cu*lum\,  n.;  pl  L.  {Opercula},  E. 
  {Operculums}.  [L.,  a  cover  or  lid,  fr  operire  to  cover.] 
  1.  (Bot.) 
  a  The  lid  of  a  pitcherform  leaf. 
  b  The  lid  of  the  urnlike  capsule  of  mosses. 
 
  2.  (Anat.) 
  a  Any  lidlike  or  operculiform  process  or  part  as  the 
  opercula  of  a  dental  follicle. 
  b  The  fold  of  integument,  usually  supported  by  bony 
  plates,  which  protects  the  gills  of  most  fishes  and 
  some  amphibians;  the  gill  cover;  the  gill  lid. 
  c  The  principal  opercular  bone  in  the  upper  and 
  posterior  part  of  the  gill  cover. 
 
  3.  (Zo["o]l.) 
  a  The  lid  closing  the  aperture  of  various  species  of 
  shells,  as  the  common  whelk.  See  Illust.  of 
  {Gastropoda}. 
  b  Any  lid-shaped  structure  closing  the  aperture  of  a 
  tube  or  shell. 
 
  From  WordNet  r  1.6  [wn]: 
 
  operculum 
  n  :  a  hard  flap  serving  as  a  cover  for  a  the  gill  slits  in 
  fishes  or  b  the  opening  of  the  shell  in  certain 
  gastropods  when  the  body  is  retracted 




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