Etymology
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ventricle (n.)

late 14c., "small chamber or cavity within a bodily organ," especially of the heart, from Latin ventriculus (in reference to the heart, ventriculus cordis), literally "little belly," diminutive of venter (genitive ventris) "belly" (see ventral).

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Definitions of ventricle

ventricle (n.)
one of four connected cavities in the brain; is continuous with the central canal of the spinal cord and contains cerebrospinal fluid;
ventricle (n.)
a chamber of the heart that receives blood from an atrium and pumps it to the arteries;
Synonyms: heart ventricle
From wordnet.princeton.edu