noun: a chamber of the heart that receives blood from an atrium and pumps it to the arteries
noun: one of four connected cavities in the brain; is continuous with the central canal of the spinal cord and contains cerebrospinal fluid

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Keely
"The normal brain is like a harp of many strings strung to perfect harmony. The transmitting conditions being perfect, are ready, at any impulse, to induce pure sympathetic assimilation. The different strings represent the different ventricles and convolutions. The differentiations of any one from its true setting is fatal, to a certain degree, to the harmony of the whole combination. If the sympathetic condition of any physical organism carries a positive flow of 80 per cent on its whole combination, and a negative one of 20 per cent, it is the medium of perfect assimilation to one of the same ratio, if it is distributed under the same conditions to the mass of the other. If two masses of metal, of any shape whatever, are brought under perfect assimilation, to one another, their unition, when brought into contact, will be instant.'' [Keely and His Discoveries, Chapter 7] [Assimilation]