ventricle

n. cavity in an organ or a body; one of the two main chambers of the heart; any of the four cavities of the brain

In anatomy, a ventricle is a part of the body filled with fluid: Ventricle (heart), the pumping chambers of the heartVentricular system in the brainVentricle of the larynx, a structure in the larynx Penile ventrical = seminal fluid holder
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Ventricle /ven·tri·cle/ a small cavity or chamber, as in the brain or heart.ventric´ular ventricle of Arantius the rhomboid fossa, especially its [more]Ventricle - Community and Resources

Noun
1. one of four connected cavities in the brain; is continuous with the central canal of the spinal cord and contains cerebrospinal fluid
(hypernym) cavity, bodily cavity, cavum
(hyponym) fourth ventricle
(part-holonym) brain, encephalon
(part-meronym) spinal fluid, cerebrospinal fluid
2. a chamber of the heart that receives blood from an atrium and pumps it to the arteries
(synonym) heart ventricle
(hypernym) chamber
(hyponym) left ventricle

(n.)
The stomach.
  

(n.)
Fig.: Any cavity, or hollow place, in which any function may be conceived of as operating.
  

(n.)
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.