from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Anatomy A fluid-containing sac or cavity in the body of an organism. Also called reservoir.
  • n. Cytology One of the saclike vesicles that comprise the endoplasmic reticulum.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Any of the various membranes sections comprising some organelles like the Golgi apparatus and the endoplasmic reticulum.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a sac or cavity containing fluid especially lymph or cerebrospinal fluid


Latin, cistern; see cistern.
(American Heritage® Dictionary of the English Language, Fourth Edition)



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