n. (Anat.) Proventriculus. [ 1913 Webster ]

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. [ 1913 Webster ]

☞ 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 pseudocœle, situated between the hemispheres, in front of, or above, the fornix, and entirely disconnected with the other cavities. See Brain, and Cœlia. [ 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. Hale. [ 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. Shak. [ 1913 Webster ]