from The Century Dictionary and Cyclopedia
- n. The cavity of the midbrain, or mesencephalon, in the embryonic vertebrate. Its medioventral portion becomes the iter, or aqueduct of Sylvius, while its dorsolateral portions become the optic ventricles, or optoeœles, of a more advanced stage of development.
Sorry, no etymologies found.
The organ of thought then is the mid-ventricle of the brain, and the vital spirit it contains .