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   cyst

   /sɪst/

   noun

   • 1. a thin-walled hollow organ or cavity in an animal or plant, containing a liquid secretion; a sac, vesicle, or bladder.
   • 2. a membranous sac or cavity of abnormal character in the body, containing fluid.
   • 3. a tough protective capsule enclosing the larva of a parasitic worm or the resting stage of an organism.

   Word Origin early 18th century: from late Latin cystis, from Greek kustis ‘bladder’.

   Scrabble Points: 9

   • C

     3

   • Y

     4

   • S

     1

   • T

     1

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