Webster's English Dictionary

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cistern

cis.tern \'sis-t*rn\ n [ME, fr. OF cisterne, fr. L cisterna, fr. cista box, 
   chest m more at CHEST 1: an artificial reservoir for storing liquids, esp. 
   water; specif :: an often underground tank for storing rainwater 2: a 
   fluid-containing sac or cavity in an organism