(vĕnʹtrĭ-kəl) noun. A small cavity or chamber within a body or an 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. b. The chamber on the right side of the heart that receives venous blood from the right atrium and forces it into the pulmonary artery. c. Any of the interconnecting cavities of the brain, ventrikel: the left ventricle of the heart, ventrikel kiri jantung; the adult human brain normally has four ventricles, otak manusia dewasa biasanya mempunyai empat ventrikel.