1. Zoology. any of various hollow organs or parts in an animal body.
  2. Anatomy.
    1. either of the two lower chambers on each side of the heart that receive blood from the atria and in turn force it into the arteries.
    2. one of a series of connecting cavities of the brain.

noun anatomy

  1. a chamber of the heart, having thick muscular walls, that receives blood from the atrium and pumps it to the arteries
  2. any one of the four main cavities of the vertebrate brain, which contain cerebrospinal fluid
  3. any of various other small cavities in the body

late 14c., from Latin ventriculus “stomach,” diminutive of venter (genitive ventris) “belly” (see ventral).


  1. A small cavity or chamber within a body or organ, especially the right or left ventricle of the heart or any of the interconnecting ventricles of the brain.

  1. A chamber of the heart that receives blood from one or more atria and pumps it by muscular contraction into the arteries. Mammals, birds, and reptiles have two ventricles; amphibians and fish have one.
  2. Any of four fluid-filled cavities in the brain of vertebrate animals. The ventricles are filled with cerebrospinal fluid.

The two lower chambers of the heart, which receive blood from the atria and pump it into the arteries. (See circulatory system.)

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