From The Collaborative International Dictionary of English v.0.48:

Ventricle \Ven"tri*cle\, n. [L. ventriculus the stomach, a
   ventricle, dim. of venter the belly: cf. F. ventricule. See
   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.
      [1913 Webster]

   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.
         [1913 Webster]

   2. The stomach. [Obs.]
      [1913 Webster]

            Whether I will or not, while I live, my heart beats,
            and my ventricle digests what is in it. --Sir M.
      [1913 Webster]

   3. Fig.: Any cavity, or hollow place, in which any function
      may be conceived of as operating.
      [1913 Webster]

            These [ideas] are begot on the ventricle of memory.
      [1913 Webster] Ventricose
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