ventricle

ven·tri·cle   (věn'trĭ-kəl)    n.  A small cavity or chamber within a body or organ, especially: a. The chamber on the left side of the heart that receives arterial blood from the left atrium and contracts to force it into the aorta. [Middle English, from Old French ventricule, from Latin ventriculus, diminutive of venter, belly.]

ventricle 

Main Entry: ven·tri·cle
Pronunciation: 'ven-tri-k&l
Function: noun
: a cavity of a bodily part or organ: as a : a chamberof the heart which receives blood from a corresponding atrium and from which blood is forced into the arteries b : one of the system of communicating cavities in the brain that arecontinuous with the central canal of the spinal cord, that like it are derived from the medullary canal of the embryo, that are lined with an epithelial ependyma, and that contain a serous fluid—see LATERAL VENTRICLE, THIRDVENTRICLE, FOURTH VENTRICLE c : a fossa or pouch on each side of the larynx between thefalse vocal cords above and the true vocal cords below

ventricle ven·tri·cle (věn'trĭ-kəl)
n.
A small cavity or chamber within a body or an organ, especially the right or left ventricle of the heart or any of the interconnecting ventricles of the brain.