Source : Webster's Revised Unabridged Dictionary (1913)

Ventricle \Ven"tri*cle\, n. [L. ventriculus the stomach, a
   ventricle, dim. of venter the belly: cf. F. ventricule. See
   {Ventral}.]
   1. (Anat.) A cavity, or one of the cavities, of an organ, as
      of the larynx or the brain; specifically, the posterior
      chamber, or one of the two posterior chambers, of the
      heart, which receives the blood from the auricle and
      forces it out from the heart. See {Heart}.

   Note: The principal ventricles of the brain are the fourth in
         the medulla, the third in the midbrain, the first and
         second, or lateral, ventricles in the cerebral
         hemispheres, all of which are connected with each
         other, and the fifth, or pseudoc[oe]le, situated
         between the hemispheres, in front of, or above, the
         fornix, and entirely disconnected with the other
         cavities. See {Brain}, and {C[oe]lia}.

   2. The stomach. [Obs.]

            Whether I will or not, while I live, my heart beats,
            and my ventricle digests what is in it. --Sir M.
                                                  Hale.

   3. Fig.: Any cavity, or hollow place, in which any function
      may be conceived of as operating.

            These [ideas] are begot on the ventricle of memory.
                                                  --Shak.

Source : WordNet®

ventricle
     n 1: one of four connected cavities in the brain; is continuous
          with the central canal of the spinal cord and contains
          cerebrospinal fluid
     2: a chamber of the heart that receives blood from an atrium
        and pumps it to the arteries [syn: {heart ventricle}]