Webster's English Dictionary

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cisterna

cis.ter.na \sis-'t*r-n*\ \-.ne-\ \sis-'t*rn-*l\ n or cis.ter.nae [NL, fr. 
   L, reservoir] pl  : CISTERN; esp : one of the large spaces under the 
   arachnoid  membrane - cis.ter.nal aj