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cyst

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cyst


  2  definitions  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Cyst  \Cyst\  (s[i^]st),  n.  [Gr.  ky`stis  bladder,  bag,  pouch,  fr 
  ky`ein  to  be  pregnant.  Cf  {Cyme}.] 
  1.  (Med.) 
  a  A  pouch  or  sac  without  opening,  usually  membranous  and 
  containing  morbid  matter,  which  is  accidentally 
  developed  in  one  of  the  natural  cavities  or  in  the 
  substance  of  an  organ. 
  b  In  old  authors,  the  urinary  bladder,  or  the  gall 
  bladder.  [Written  also  {cystis}.] 
 
  2.  (Bot.)  One  of  the  bladders  or  air  vessels  of  certain 
  alg[ae],  as  of  the  great  kelp  of  the  Pacific,  and  common 
  rockweeds  ({Fuci})  of  our  shores.  --D.  C.  Eaton. 
 
  3.  (Zo["o]l.) 
  a  A  small  capsule  or  sac  of  the  kind  in  which  many 
  immature  entozoans  exist  in  the  tissues  of  living 
  animals;  also  a  similar  form  in  Rotifera,  etc 
  b  A  form  assumed  by  Protozoa  in  which  they  become 
  saclike  and  quiescent.  It  generally  precedes  the 
  production  of  germs.  See  {Encystment}. 
 
  From  WordNet  r  1.6  [wn]: 
 
  cyst 
  n  1:  a  closed  sac  that  develops  abnormally  in  some  body  structure 
  2:  a  small  anatomically  normal  sac  or  bladderlike  structure 
  (especially  one  containing  fluid)  [syn:  {vesicle}] 




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