Webster's English Dictionary

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ventricle

ven.tri.cle \'ven-tri-k*l\ n [ME, fr. L ventriculus, fr. dim. of ventr-, 
   venter belly] : a cavity of a bodily part or organ : as  : a chamber of the 
   heart which receives blood from a corresponding atrium  and from which 
   blood is forced into the arteries : one of the system of communicating 
   cavities in the brain that are conti nuous with the central canal of the 
   spinal cord